夏季休暇[kakikyuuka] summer vacation
季刊[kikan] quarterly (e.g. magazine)
季語[kigo] seasonal word (in haiku)
季候[kikou] season
季節[kisetsu] season

季節はずれ[kisetsuhazure] unseasonable
季節的[kisetsuteki] seasonal
季節風[kisetsufuu] seasonal winds
四季[shiki] four seasons
冬季[touki] (season of) winter

オブジェクト指向言語[obujekutoshikougengo] object-oriented language
コンピュータ用語[konpyuutayougo] computerese
スウェーデン語[suweedengo] Swedish (language)
スペイン語[supeingo] Spanish (language)
スワヒリ語[suwahirigo] Swahili (language)

チャン語[chango] Chinese (language)
ドイツ語[doitsugo] German (language)
フランス語[furansugo] French (language)
プログラム言語[puroguramugengo] programming language
ペルシャ語[perushago] Persian (language)