speculate vs introspect

speculate and introspect both are verbs.

Word	Noun	Adjective	Verb	Adverb
speculate	No	No	Yes	No
introspect	No	No	Yes	No

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

Other hyponyms of speculate include premeditate, theologise, theologize, bethink, cogitate, question, wonder, puzzle, consider, study.

speculate (verb)	introspect (verb)
reflect deeply on a subject	reflect on one's own thoughts and feelings
to believe especially on uncertain or tentative grounds
talk over conjecturally, or review in an idle or casual way and with an element of doubt or without sufficient reason to reach a conclusion
invest at a risk