天魚[amago] land-locked variety of red-spotted masu trout (Oncorhynchus masou ishikawae)
御天気[otenki] weather
コール天[kooruten] corded velveteen
破天連[pateren] Portuguese Jesuits (in Japan in the 16th century)
天鵝絨[tengajuu] velvet

悪天[akuten] bad weather
悪天候[akutenkou] bad weather
悪天使[akutenshi] evil angels
旭日昇天[kyokujitsushouten] full of vigor and vitality (like the rising sun) (vigour)
一天[itten] the whole sky

御孫さん[omagosan] grandchild
公孫樹[kousonju] ginkgo (Ginkgo biloba)
玄孫[genson] great-great-grandchild
子孫[shison] descendants
児孫[jison] children and grandchildren

孫引き[magobiki] citation at second remove
孫息子[magomusuko] grandson
孫娘[magomusume] granddaughter
嫡孫[chakuson] eldest son's descendants