悪念[akunen] evil thought
一念[ichinen] determined purpose
一念ほっき[ichinenhokki] being resolved to (do something)
一般概念[ippangainen] general idea
怨念[onnen] grudge

臆念[okunen] something one always remembers
概念[gainen] general idea
観念[kannen] idea
観念主義[kannenshugi] German idealism
基本概念[kihongainen] basic overview

一次記憶[ichijikioku] first memory
憶説[okusetsu] hypothesis
憶念[okunen] something one always remembers
憶病[okubyou] cowardice
仮想記憶[kasoukioku] virtual memory

憶える[oboeru] to memorize
記憶[kioku] memory
記憶装置[kiokusouchi] storage (device)
記憶媒体[kiokubaitai] storage medium
記憶法[kiokuhou] mnemonic

鼺鼠[momi] giant flying squirrel (Petaurista leucogenys)
鼯鼠[momonga] small Eurasian flying squirrel (Pteromys momonga)
熬海鼠[iriko] dried sea slug
海鼠[namako] sea cucumber (Holothuroidea spp.)
栗鼠[risu] squirrel (excluding flying squirrels)

どぶ鼠[dobunezumi] brown rat (Rattus norvegicus)
黒鼠[kuronezumi] black rat
鼠の嫁入り[nezuminoyomeiri] light shower
鼠疫[soeki] plague

鎌鼬[kamaitachi] type Japanese folkloric monster (yokai), thought to be a trio of weasels who appear in a whirlwind to cut their victim
鼬鼠[itachi] weasel (esp. the Japanese weasel, Mustela itatsi)
鼬ごっこ[itachigokko] doing the same thing repeatedly
鼬の道[itachinomichi] not to write to or visit someone
鼬の最後っ屁[itachinosaigoppe] final emergency measure (lit: the final fart of a weasel)

鼬鮫[itachizame] tiger shark (Galeocerdo cuvier)
黄鼬[ten] Japanese marten (Martes melampus)
毛長鼬[kenagaitachi] polecat (Mustela putorius)
鼬魚[itachiuo] goatsbeard brotula (species of ophidiiform fish, Brotula multibarbata)
朝鮮鼬[chousenitachi] Korean yellow weasel (Mustela sibirica coreana)