gratulatory vs congratulatory

gratulatory and congratulatory both are adjectives.

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

As adjectives, gratulatory and congratulatory are synonyms defined as:

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

gratulatory (adjective)	congratulatory (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