congratulatory vs gratulatory

congratulatory and gratulatory both are adjectives.

Word	Noun	Adjective	Verb	Adverb
congratulatory	No	Yes	No	No
gratulatory	No	Yes	No	No

As adjectives, congratulatory and gratulatory are synonyms defined as:

congratulatory and gratulatory: expressive of sympathetic pleasure or joy on account of someone's success or good fortune

congratulatory (adjective)	gratulatory (adjective)
expressive of sympathetic pleasure or joy on account of someone's success or good fortune	expressive of sympathetic pleasure or joy on account of someone's success or good fortune