cross-questioner vs questioner

cross-questioner and questioner both are nouns.

Word	Noun	Adjective	Verb	Adverb
cross-questioner	Yes	No	No	No
questioner	Yes	No	No	No

As nouns, questioner is a hypernym of cross-questioner; that is, questioner is a word with a broader meaning than cross-questioner:

cross-questioner: someone who questions a witness carefully (especially about testimony given earlier)
questioner: someone who asks a question

Other hypernyms of cross-questioner include asker, enquirer, inquirer, querier.

cross-questioner (noun)	questioner (noun)
someone who questions a witness carefully (especially about testimony given earlier)	someone who asks a question