shrew vs shrewmouse

shrew and shrewmouse both are nouns.

Word	Noun	Adjective	Verb	Adverb
shrew	Yes	No	No	No
shrewmouse	Yes	No	No	No

As nouns, shrew and shrewmouse are synonyms defined as:

shrew and shrewmouse: small mouselike mammal with a long snout; related to moles

shrew (noun)	shrewmouse (noun)
small mouselike mammal with a long snout; related to moles	small mouselike mammal with a long snout; related to moles
a scolding nagging bad-tempered woman