沼|ぬまnuma[2]odaka (tail-high)

1. nounmarsh; swamp; wetland; bog; pond
   その沼ぬまにはサギがたくさん住すんでいる。↗

   Lots of herons live in the marsh.
2. noun, noun (suffix)obsession; addiction; being hooked on; getting sucked into
3. nounugly man
4. nounretard; mentally disabled person

• Synonym沼沢しょうたくWrittenWritten, academic word for a marsh or swamp; 「沼」 is the everyday term and also works figuratively for being hooked on something.
• Synonym沼地ぬまちNeutralMarshy, muddy land; it stresses the terrain rather than the water itself. Neutral in register.
• Synonym湿地しっちNeutralWet ground in the broadest sense — damp land that need not hold standing water; 「沼」 is specifically a small body of water.
• Synonym沼沢地しょうたくちWrittenWritten and academic term for a marshy area or wetland; keep it to formal prose rather than conversation.
• Related湿原しつげんNeutralA wetland of grassy marshland, as in 「釧路湿原」; it highlights grass-covered wetlands rather than a stretch of open water.
• Related沼池WrittenA written, little-used word for ponds and marshes; 「沼」 is the everyday choice.
• Antonym乾地WrittenDry land; a written word for ground that is the opposite of wet, marshy terrain.

Use 「沼」 for a marsh or, figuratively, being hooked on something, as in 「沼にはまる」. For academic prose pick 「沼沢」; for grassy wetlands 「湿原」; for wet ground in general 「湿地」; for dry land 「乾地」.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

1. 陸地りくちに囲かこまれた水域すいいきのうち、規模きぼの小ちいさいもの。
2. 没入ぼつにゅうして抜け出ぬけだせない趣味しゅみの世界せかい。