male genitals vs male genitalia

male genitals and male genitalia both are nouns.

Word	Noun	Adjective	Verb	Adverb
male genitals	Yes	No	No	No
male genitalia	Yes	No	No	No

As nouns, male genitals and male genitalia are synonyms defined as:

Other synonyms of male genitals include family jewels, male genital organ.

male genitals (noun)	male genitalia (noun)
external male sex organs	external male sex organs