muscle vs animal tissue

muscle and animal tissue both are nouns.

Word	Noun	Adjective	Verb	Adverb
muscle	Yes	No	Yes	No
animal tissue	Yes	No	No	No

As nouns, animal tissue is a hypernym of muscle; that is, animal tissue is a word with a broader meaning than muscle:

muscle (noun)	animal tissue (noun)
possessing muscular strength	the tissue in the bodies of animals
authority or power or force (especially when used in a coercive way)
one of the contractile organs of the body
animal tissue consisting predominantly of contractile cells
a bully employed as a thug or bodyguard

muscle (verb)	animal tissue (verb)
make one's way by force