At omniglot.com, we find scripts whose characters more-or-less stand for consonant phonemes, or all phonemes, or syllables, or words. But I've never heard of a language whose written form consists entirely of phonemic symbols plus separate symbols for grammatical morphemes whether free (like adpositions or conjunctions) or bound (like case or tense affixes).
Has any of the readers heard of such a script?
In English writing, we have a limited number of grammatical morpheme characters on our keyboards, such as "&" and "@," but we don't use them in formal prose. But I'm talking about a writing system with a bigger repertoire of grammatical morpheme characters.