preen vs congratulate

preen and congratulate both are verbs.

Word	Noun	Adjective	Verb	Adverb
preen	No	No	Yes	No
congratulate	No	No	Yes	No

As verbs, preen and congratulate are synonyms defined as:

preen and congratulate: pride or congratulate (oneself) for an achievement

preen (verb)	congratulate (verb)
dress or groom with elaborate care	say something to someone that expresses praise
pride or congratulate (oneself) for an achievement	express congratulations
clean with one's bill	pride or congratulate (oneself) for an achievement
	be proud of