mouse's nest vs mouse nest

mouse's nest and mouse nest both are nouns.

Word	Noun	Adjective	Verb	Adverb
mouse's nest	Yes	No	No	No
mouse nest	Yes	No	No	No

As nouns, mouse's nest and mouse nest are synonyms defined as:

mouse's nest (noun)	mouse nest (noun)
where mice bear and raise their young	where mice bear and raise their young