Shiitake, a kind of mushroom
Sudoku, a numbers game
Haiku poetry
Kimono and geisha
Sumo wrestling (although the English and Japanese pronunciation of sumo are very different)
Anime
Pokemon (abbreviation for "pocket monster")
Godzilla
Emoji
Most people don't know that the word rickshaw comes from Japanese, derived from the word jinrikisha
The use of the word yen to refer to Japanese money, which is not the word used in Japanese. 100 yen is pronounced 100 en in Japanese.
Hibachi, a small BBQ grill
Karaoke, another widely used word
Harakiri ("hairy kerry"), ritual suicide by sword. (Most English speakers don't know that Japanese people don't usually say harakiri, they prefer a different word.)
Sayonara is known by a surprisingly large number of English speakers
Kamikaze pilots (but most English speakers are shocked to learn that the actual word used by Japanese speakers is not kamikaze. More than once I have heard English speakers use the word kamikaze while speaking to a Japanese person and the Japanese person has no idea what the English speaker is talking about.) I don't think a Japanese person would understand the phrase kamikaze taxi driver as it is used in English.
Banzai charge is another phrase not used the same way by English and Japanese speakers. The same is true of the word banzai,
Sushi and sukiyaki (and maybe ramen too)
Sake rice wine
Shamisen three-string 'guitar'
Shinto religion
The musical instrument koto
The name of the Japanese board game go comes from the Japanese name for the game, igo (not from the Chinese name for the game, which is completely different)
Ninja and
samurai are perhaps the best known Japanese to English words.
Shogun too.
The word Japan is actually a verb in English, to Japan something, meaning to coat something with a heavy coat of black lacquer, as in to Japan a wooden box