Grammatical relation and Linguistic relation

Grammatical relation noun - A linguistic relation established by grammar.

Linguistic relation and grammatical relation are semantically related. In some cases you can use "Linguistic relation" instead a noun phrase "Grammatical relation".

Linguistic relation noun - A relation between linguistic forms or constituents.

Grammatical relation and linguistic relation are semantically related. Sometimes you can replace phrase "Grammatical relation" with "Linguistic relation", this phrases are similar.