自然【しぜん】
nature, natural, spontaneous, automatic, naturally, spontaneously, automatically
当然【とうぜん】
natural, right, proper, just, reasonable, appropriate, deserved, naturally, as a matter of course, rightly, deservedly, justly, of course
依然【いぜん】
still, as yet, as it has been
依然として【いぜんとして】
still, as yet, as of old
天然【てんねん】
nature, spontaneity, natural airhead
突然【とつぜん】
abrupt, sudden, unexpected
天然ガス【てんねんガス】
natural gas
不自然【ふしぜん】
unnatural, artificial, affected, strained
偶然【ぐうぜん】
coincidence, chance, accident, fortuity, by chance, unexpectedly, accidentally, contingency
天然記念物【てんねんきねんぶつ】
natural monument, protected species (animal, habitat, etc.)
未然【みぜん】
before it happens, previously
全然【ぜんぜん】
(not) at all, (not) in the slightest, wholly, entirely, completely, totally, extremely, very
騒然【そうぜん】
noisy, confused, uproarious
公然【こうぜん】
open, public, official, overt
必然的【ひつぜんてき】
inevitable, necessary
大自然【だいしぜん】
nature, Mother Nature
自然界【しぜんかい】
nature, the natural world, realm of nature
断然【だんぜん】
firmly, flatly, resolutely, decisively, absolutely, definitely, definitely (wrong, different, etc.), absolutely, by far, far and away, by a long shot, hands down
自然科学【しぜんかがく】
natural science
必然【ひつぜん】
inevitable, necessary, certain, sure, inevitability, necessity