併用 (へいよう)using together (jointly); used at the same time

using together (jointly); used at the same timenoun (common) (futsuumeishi), noun or participle which takes the aux. verb suru

併用, its kanji, and other words that share them.Open this graph

Kanji in 併用

合併がっぺいmerger (of companies, towns, etc.); combination
併殺へいさつdouble play
併合へいごうmerger; joining into one
併せるあわせるto match (rhythm, speed, etc.)
合併症がっぺいしょうcomplications (in an illness)
併設へいせつjoint establishment (esp. schools of different levels or different courses of study); establishment as an annex (e.g. of a school)
併ししかしhowever; but
併し乍らしかしながらhowever; nevertheless
使用しようuse; application
利用りようuse; utilization
採用さいようuse; adoption
費用ひようcost; expense
雇用こようemployment (long term); hire
乗用車じょうようしゃ(passenger) car; automobile
信用しんようconfidence; trust
運用うんようmaking use of; application

See how 併用 connects to the rest of Japanese.