sewer vs baster

sewer and baster both are nouns.

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

As nouns, baster is a hyponym of sewer; that is, baster is a word with a more specific, narrower meaning than sewer:

Other hyponyms of sewer include tacker, sewing-machine operator, tucker.

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