marten vs marten cat

marten and marten cat both are nouns.

Word	Noun	Adjective	Verb	Adverb
marten	Yes	No	No	No
marten cat	Yes	No	No	No

As nouns, marten and marten cat are synonyms defined as:

marten and marten cat: agile slender-bodied arboreal mustelids somewhat larger than weasels

marten (noun)	marten cat (noun)
agile slender-bodied arboreal mustelids somewhat larger than weasels	agile slender-bodied arboreal mustelids somewhat larger than weasels