he; boyfriend

a first, start, a beginning / (slang) first sexual relations, one's first time

professional (プロフェッショナル) / production (プロダクション) / proletarian (プロレタリア, プロレタリアート) / prostitute (プロスチチュート) / proportion (プロポーション) / program (プログラム) / propaganda (プロパガンダ)

(slang) professional; like a pro

Short for 競技プログラミング (“competitive programming”).

the first..., initial..., new...

a first, start

the first of something

innocent / inexperienced, green

beginning, start / first, initial