cogent vs weighty

cogent and weighty both are adjectives.

Word	Noun	Adjective	Verb	Adverb
cogent	No	Yes	No	No
weighty	No	Yes	No	No

As adjectives, cogent and weighty are synonyms defined as:

Other synonyms of cogent include telling.

cogent (adjective)	weighty (adjective)
powerfully persuasive	having relatively great weight; heavy
	excessively fat
	weighing heavily on the spirit; causing anxiety or worry
	of great gravity or crucial import; requiring serious thought
	powerfully persuasive