HARD (ER) KANJI - JLPT 2 KYUU

Looks like a house put together well
ゴウカッ to be together; to fit
相合傘 ai ai gasa - 2 people sharing an umbrella <see also ai>
場合 ba ai - a case, situation
具合 gu ai - condition (of various things)
都合 tsu gou - circumstances, condition, convenience