sandman vs hob

sandman and hob both are nouns.

Word	Noun	Adjective	Verb	Adverb
sandman	Yes	No	No	No
hob	Yes	No	Yes	No

As nouns, hob is a hypernym of sandman; that is, hob is a word with a broader meaning than sandman:

sandman: an elf in fairy stories who sprinkles sand in children's eyes to make them sleepy
hob: (folklore) fairies that are somewhat mischievous

Other hypernyms of sandman include brownie, elf, gremlin, imp, pixie, pixy.

sandman (noun)	hob (noun)
an elf in fairy stories who sprinkles sand in children's eyes to make them sleepy	a shelf beside an open fire where something can be kept warm
	a hard steel edge tool used to cut gears
	(folklore) a small grotesque supernatural creature that makes trouble for human beings
	(folklore) fairies that are somewhat mischievous

sandman (verb)	hob (verb)
	cut with a hob