add, increase

さんか

participation

ぞうか

increase

かげん

adjustment; addition and subtraction

くわえる

to append, to sum up, to add (up)

くわわる

to join in, to accede to

かみ

seasoning, flavoring

かそく

acceleration

かそくど

acceleration

かねつ

heating

ついか

addition, supplement, appendix

かにゅう

becoming a member, admission

いいかげん

random, irresponsible

つけくわえる

to add one thing to another