"I can only write or say a sentence involving words I have seen or heard only about things I have ever perceived / phenomenon I have ever noticed."
That sentence is true when applied to a human being. You can only write or say a sentence with words you know. You cannot write or say a sentence with words you do not know. [I can't even believe I had to write that. :)]
What makes us human is language. As Jacques Lacan noted and people don't seemed to have picked up on is that We are speaking beings, or êtres parlants. However, your question is philosophically flawed. It is flawed because language "just is" a human attribute, and there cannot be anything above or below language as language is not a referent (thing) located in space. Language is the realm of the human subject.
As for perception of reality, there is a difference between reality and the real.
The real is this:
In continental philosophy, the Real (or the Real Order of the
Borromean knot)1 is the totality of reality, the intelligible form
of the horizon of truth of the field-of-objects that has been
disclosed,2 and is opposed in the unconscious to the Symbolic
(fantasy, dreams, hallucinations):4[6] "What has been foreclosed
from the Symbolic reappears in the Real."[7] In depth psychology and
human geography, the Real can be particularly described as a "negative
space", a philosophical void of sociality and subjectivity, a
traumatic consensus of intersubjectivity, or as an absolute
noumenalness between signifiers.[13] The real
How can this be shown to someone, this difference between reality and the real? Like this:
Imagine you have a shelf of books, lined up one after the other, without any space between them. OK, that's very usual. Now, imagine you remove a (one) book from the shelf so there is a space where it was. There is a space there now between two of the books. So, how can one describe this situation? Well, commonly, one might say: There is a book missing from the shelf. [to refer to that space]. But here's the truth: "Nothing is missing in the real". This little thought experiment shows this difference.
Lacan's concept of speech as a "symbolic exchange" which "links human beings to each other'" 2 is clearly influenced by the work of Mauss and Lévi-Strauss, especially their analysis of the exchange of gifts.
symbolic system
Animals, by the way, "speak" but they cannot wield signifiers and signifieds.
As funny and interesting take on all this can be found in this post by Leon Brenner, which I quote in part here:
This unique symbolic capacity is captured in the very human aptitude to lie by telling the truth. An ability which is perfectly depicted
in a joke Freud tells about two Jewish people talking in a train
station. This joke is worth being quoted at length – after which I
will leave you to ruminate on the Kantian notion that dictates that
one should always tell the truth.
The Joke:
“Two Jews met in a railway carriage at a station in Galicia. ‘Where
are you going?’ asked one. ‘To Cracow’, was the answer. ‘What a liar
you are!’ broke out the other. ‘If you say you’re going to Cracow, you
want me to believe you’re going to Lemberg. But I know that in fact
you’re going to Cracow. So why are you lying to me?'” (Freud, Jokes
and their Relation to the Unconscious, p. 115)
Lacan and his animals
Obviously, language used by some humans (speech) can be used to manipulate other human beings. Not everything a person feels can be expressed by and in language. There is an inadequacy here that is a fact. Human beings can only speak and can point to the real. Reality is a subjective thing (it belongs to subjects, humans). Not everyone's "reality" is the same. The horrors of the Holocaust, for example, are just that horrors. And unfortunately, we are again witnessing horrors ... in Ukraine.
In the U.S. structural linguistics is found to be passé by some. It is useful to be very careful here. Wikipedia has a pretty good overview of the "debate" on this issue. structural linguistics.
There is a fundamental difference between subject and object in science and life.
Thomas Nagel famously argued that explaining subjective experience—the
"what it is like" to be something—is currently beyond the reach of
scientific inquiry, because scientific understanding by definition
requires an objective perspective, which, according to Nagel, is
diametrically opposed to the subjective first-person point of view.
Furthermore, one cannot have a definition of objectivity without being
connected to subjectivity in the first place since they are mutual and
interlocked.
Nagel
Every time a scientist writes an academic paper or conducts a scientific experiment, her or his subjectivity comes into play. Without it, they couldn't even do their work. This fundamental fact is often overlooked by those who claim that "objectivity" exists on its own, as if a human being can completely divorce themselves from their subjectivity and only be guided by an object.