Adult male and Signior

Adult male noun - An adult person who is male (as opposed to a woman).

Signior and adult male are semantically related. In some cases you can replace term "Signior" with "Adult male", this terms are similar.

Signior noun - Used as an Italian courtesy title; can be prefixed to the name or used separately.

Adult male and signior are semantically related. You can use "Adult male" instead a noun "Signior".