やま・山yama[2]odaka (tail-high)

1. noun, countermountain; hill
   高たかい山やまの頂上ちょうじょうは空気くうきが薄うすい。↗

   The air is thin at the top of a high mountain.
2. noun, countermine
3. noun, counter(mountain) forest
4. noun, counterheap; pile; stack; mountain
   洗濯物せんたくものの山やまを見みながら、私はため息いきをついた。↗

   Looking at the pile of laundry, I sighed.
5. nounprotruding or high part of an object; crown (of a hat); thread (of a screw); tread (of a tire)
6. nounclimax; peak; critical point
7. nounguess; speculation; gamble
   うまくあの先生せんせいのやまを当あてたわね。↗

   You've sure got the teacher's number.
8. noun(criminal) case; crimepolice and crime reporter jargon; usu. written as ヤマ
9. nounmountain climbing; mountaineering
10. nounfestival float (esp. one mounted with a decorative halberd)
11. noun, card gamesdeck (from which players draw cards); draw pile; stock
12. noun, mahjongwall; wall tile
13. noun (prefix)wildbefore the name of a plant or animal

• Synonym岳たけWrittenWritten word for a high, steep mountain; mostly a suffix in mountain names like 「槍ヶ岳」, rarely used on its own.
• Synonym山岳さんがくWrittenWritten/formal word for steep mountains or mountainous terrain, as in 「山岳地帯」 and 「山岳救助」; everyday speech just uses 「山」.
• SynonymマウンテンNeutralLoanword for mountain; can stand alone but mostly appears in compounds like 「マウンテンバイク」. In everyday talk, say 「山」.
• Synonymお山おやまNeutralHonorific or affectionate way to say 「山」, often for sacred mountains, as in 「お山に登る」.
• Antonym谷たにNeutralAntonym of 「山」: a valley, ravine or gorge — low ground between heights rather than rising ground.
• Antonym平地へいちNeutralAntonym of 「山」: flat, level land with no mountains or slopes.

Default to 「山」 for mountains in any context. Use 「岳」 in mountain names, 「山岳」 for steep mountains in written prose, and 「マウンテン」 mainly in loanword compounds; 「谷」 and 「平地」 are the opposites.

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

1. （やま）土地とちが周囲しゅういよりも高たかく盛り上もりあがった地形ちけい。
2. （やま）高たかく積つみあがった状態じょうたい。
3. （やま）物事ものごとの絶頂ぜっちょう。
4. （やま）感かんじの一番いちばん強つよいところ。クライマックス。
5. （やま）多おおいこと。
6. （やま）あてずっぽう。
7. （やま）寺てら、境内けいだい。特とくに比叡山ひえいざん延暦寺えんりゃくじをいう。
8. （やま）鉱山こうざん。
9. （やま、サン、ザン、セン、ゼン）山やまの名称めいしょうを表あらわす。