talk vs pontificate

talk and pontificate both are nouns.

Word	Noun	Adjective	Verb	Adverb
talk	Yes	No	Yes	No
pontificate	Yes	No	Yes	No

As verbs, pontificate is a hyponym of talk; that is, pontificate is a word with a more specific, narrower meaning than talk:

talk (noun)	pontificate (noun)
the act of giving a talk to an audience	the government of the Roman Catholic Church
an exchange of ideas via conversation
idle gossip or rumor
a speech that is open to the public
discussion; (`talk about' is a less formal alternative for `discussion of')

talk (verb)	pontificate (verb)
express in speech	talk in a dogmatic and pompous manner
exchange thoughts; talk with	administer a pontifical office
reveal information
use language
deliver a lecture or talk
divulge confidential information or secrets