stem or continuative form of くう (kuu) [godan]

stake, pile, post

九月, 9月: September

苦心: pain, trouble, anxiety, diligence, hard work

苦心: struggle to do

時空: time-space

遺族: bereaved family

医薬: medicine / 意訳: liberal translation / 違約: breach of contract

(weaponry) a Japanese throwing weapon, possibly derived from a masonry trowel

(informal, slang) isn't it, aren't you (said when seeking confirmation from the listener)