Word

楽天

らくてん
optimism
Word

天文学

てんもんがく
astronomy
Word

天下

てんか、てんが、てんげ
the whole world; the whole country; society; the public; supremacy over a nation; government of a country; the ruling power; having one's own way; doing as one pleases; peerless; incomparable; superlative; world-famous; shogun (Edo period)
Word

天井

てんじょう
ceiling; ceiling price
Word

天文台

てんもんだい
astronomical observatory
Word

天狗

てんぐ
long-nosed goblin; bragging; braggart
Word

天草

てんぐさ、テングサ
any red algae in the family Gelidiaceae (esp. Gelidium crinale)
Word

天然記念物

てんねんきねんぶつ
natural monument; protected species (animal, habitat, etc.)
Word

四天王

してんのう
the Four Heavenly Kings (Dhrtarastra, Virudhaka, Virupaksa, and Vaisravana); the big four (i.e. four leaders in a given field)
Word

天空

てんくう
sky; air; ether; firmament; the heavens