Is there an established term in linguistics which is a hypernym of both 'things' (e.g. entities; categories of entities; actions; ...), and the relationships between them?
Intuitively, I would assume that maybe 'concepts' would work. I can have a (mental) concept of 'dog' (category), a mental concept of a specific entity, e.g. 'Mike', a concept of 'dancing' (action), and a concept of relations, e.g. 'is_a' as in 'Mike is_a Dog', or 'has_owner' as in 'Mike has_owner Karl'.
Framed differently, I am interested in whether there is a linguistic term which covers subject, predicate and object in a semantic triple <s,p,o>.
Is 'concept' the right choice here, or is there another term used in scholarly contexts which encompasses both things/actions and relations between those?