oldwife vs old squaw

oldwife and old squaw both are nouns.

Word	Noun	Adjective	Verb	Adverb
oldwife	Yes	No	No	No
old squaw	Yes	No	No	No

As nouns, oldwife and old squaw are synonyms defined as:

oldwife and old squaw: a common long-tailed sea duck of the northern parts of the United States

Other synonyms of oldwife include Clangula hyemalis.

oldwife (noun)	old squaw (noun)
tropical Atlantic fish	a common long-tailed sea duck of the northern parts of the United States
a common long-tailed sea duck of the northern parts of the United States