whatever vs whatsoever

whatever and whatsoever both are adjectives.

Word	Noun	Adjective	Verb	Adverb
whatever	No	Yes	No	No
whatsoever	No	Yes	No	No

As adjectives, whatever and whatsoever are synonyms defined as:

whatever and whatsoever: one or some or every or all without specification; entity, elective existential pronoun; quantifier, elective existential

Other synonyms of whatever include any.

whatever (adjective)	whatsoever (adjective)
one or some or every or all without specification; entity, elective existential pronoun; quantifier, elective existential	one or some or every or all without specification; entity, elective existential pronoun; quantifier, elective existential