equal vs successor

equal and successor both are nouns.

Word	Noun	Adjective	Verb	Adverb
equal	Yes	Yes	Yes	No
successor	Yes	No	No	No

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

equal (noun)	successor (noun)
a person who is of equal standing with another in a group	a thing or person that immediately replaces something or someone
	a person who inherits some title or office
	a person who follows next in order

equal (adjective)	successor (adjective)
having the same quantity, value, or measure as another
having the requisite qualities or resources to meet a task

equal (verb)	successor (verb)
make equal, uniform, corresponding, or matching
be identical or equivalent to
be equal to in quality or ability