nearer vs nigher

nearer and nigher both are adverbs.

Word	Noun	Adjective	Verb	Adverb
nearer	No	No	No	Yes
nigher	No	No	No	Yes

As adverbs, nearer and nigher are synonyms defined as:

nearer and nigher: (comparative of `near' or `close') within a shorter distance

Other synonyms of nearer include closer.

nearer (adverb)	nigher (adverb)
(comparative of `near' or `close') within a shorter distance	(comparative of `near' or `close') within a shorter distance