灰塵: ash and dust; something worthless / 灰燼: ash and cinders / 怪人: someone mysterious (in a negative way) / 芥塵: trash, rubbish / 海人: someone who lives by the sea; a fisherman or fisherwoman

回文: palindrome

貝類: shellfish

海流: (oceanic) current

開催: holding a conference or event

scallop mantle (as a food)

The hiragana syllable ち (chi). Its equivalent in katakana is チ (chi). It is the seventeenth syllable in the gojūon order; its position is た行い段 (ta-gyō i-dan, “row ta, section i”).

七月, 7月: July

世知: worldly wisdom

蜂: bee