blower vs grain blower

blower and grain blower both are nouns.

Word	Noun	Adjective	Verb	Adverb
blower	Yes	No	No	No
grain blower	Yes	No	No	No

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

Other hyponyms of blower include bellows, blow drier, blow dryer, hair drier, hair dryer, hand blower, suction blower.

blower (noun)	grain blower (noun)
large aquatic carnivorous mammal with fin-like forelimbs no hind limbs, including: whales, dolphins, porpoises, narwhals	a blower for pneumatic grain transport.
a device that produces a current of air
a fan run by an electric motor