ちくちく痛む[chikuchikuitamu] to prickle
哀痛[aitsuu] sorrowing with the bereaved
圧痛点[attsuuten] pressure point
胃痛[itsuu] stomach-ache
筋肉痛[kinnikutsuu] muscular pain

苦痛[kutsuu] pain
腰痛[youtsuu] lower back (or hip) pain
手痛い[teitai] severe
陣痛[jintsuu] labour (birth) pains
精神的苦痛[seishintekikutsuu] mental anguish

インフラ開発[infurakaihatsu] infrastructure development
エンジン発動機[enjinhatsudouki] engine
バス発着場[basuhacchakujou] depot
発条[bane] spring (e.g. coil, leaf)
ロケット発射筒[rokettohasshatou] rocket launcher

異常発生[ijouhassei] plague
一触即発[isshokusokuhatsu] critical (touch and go) situation
一念発起[ichinenhokki] being resolved to (do something)
一発[ippatsu] one shot
一発かます[ippatsukamasu] to hit someone

ストックホルム症候群[sutokkuhorumushoukougun] Stockholm syndrome
亜群[agun] subgroup
一群[ichigun] group
一群れ[hitomure] group
可換群[kakangun] Abelian group

魚群[gyogun] school of fish
繰込み群[kurikomigun] renormalisation group (physics)
群がる[muragaru] to swarm
群れ[mure] group

データの先頭[deetanosentou] beginning of data
一頭[ittou] one large animal (horses, cattle, etc.)
一頭立て[ittoudate] one-horse (carriage)
咽頭[intou] pharynx
駅頭[ekitou] station

音頭[ondo] leading a group of people
会頭[kaitou] society president
街頭[gaitou] in the street
核弾頭[kakudantou] nuclear warhead
巻頭[kantou] opening page of book