screw auger vs auger

screw auger and auger both are nouns.

Word	Noun	Adjective	Verb	Adverb
screw auger	Yes	No	No	No
auger	Yes	No	No	No

As nouns, screw auger and auger are synonyms defined as:

Other synonyms of screw auger include gimlet, wimble.

screw auger (noun)	auger (noun)
hand tool for boring holes	hand tool for boring holes
	a long flexible steel coil for dislodging stoppages in curved pipes