equal vs differ

equal is a noun but differ is not a noun.

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

equal (noun)	differ (noun)
a person who is of equal standing with another in a group

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

equal (verb)	differ (verb)
make equal, uniform, corresponding, or matching	be of different opinions
be identical or equivalent to	be different
be equal to in quality or ability