goblin vs hobgoblin

goblin and hobgoblin both are nouns.

Word	Noun	Adjective	Verb	Adverb
goblin	Yes	No	No	No
hobgoblin	Yes	No	No	No

As nouns, goblin and hobgoblin are synonyms defined as:

goblin and hobgoblin: (folklore) a small grotesque supernatural creature that makes trouble for human beings

Other synonyms of goblin include hob.

goblin (noun)	hobgoblin (noun)
(folklore) a small grotesque supernatural creature that makes trouble for human beings	an object of dread or apprehension
	(folklore) a small grotesque supernatural creature that makes trouble for human beings