fulminate vs appear

fulminate is a noun but appear is not a noun.

Word	Noun	Adjective	Verb	Adverb
fulminate	Yes	No	Yes	No
appear	No	No	Yes	No

As verbs, appear is a hypernym of fulminate; that is, appear is a word with a broader meaning than fulminate:

Other hypernyms of fulminate include come along.

fulminate (noun)	appear (noun)
a salt or ester of fulminic acid

fulminate (verb)	appear (verb)
cause to explode violently and with loud noise	come into sight or view
come on suddenly and intensely	be issued or published
criticize severely	come into being or existence, or appear on the scene
	appear as a character on stage or appear in a play, etc.
	give a certain impression of being something or having a certain aspect
	(of a proposition) seem to be true, probable, or apparent
	present oneself formally, as before a (judicial) authority