baster vs sewer

baster and sewer both are nouns.

Word	Noun	Adjective	Verb	Adverb
baster	Yes	No	No	No
sewer	Yes	No	No	No

As nouns, sewer is a hypernym of baster; that is, sewer is a word with a broader meaning than baster:

baster (noun)	sewer (noun)
a tube with a rubber bulb used to take up and release melted fat or gravy in order to moisten roasting meat	a waste pipe that carries away sewage or surface water
a sewer who fastens a garment with long loose stitches	misfortune resulting in lost effort or money
a cook who bastes roasting meat with melted fat or gravy	someone who sews