参加【さんか】
participation, joining, entry
加盟【かめい】
joining (an association, agreement, etc.), participation, affiliation, accession
増加【ぞうか】
increase, rise, growth, addition, increment
追加【ついか】
addition, supplement, appending, appendix
加入【かにゅう】
joining (a club, organization, etc.), becoming a member, entry, admission, subscription, affiliation, signing (e.g. a treaty), taking out (insurance)
加工【かこう】
manufacturing, processing, treatment, machining
加速【かそく】
acceleration, speeding up
付加【ふか】
addition, annexation, appendage
加害者【かがいしゃ】
perpetrator, wrong-doer, aggressor, assailant, offender
加熱【かねつ】
heating, application of heat
加減【かげん】
degree, extent, amount, balance, state, condition, (health) condition, state of health, adjustment, moderation, regulation, addition and subtraction, slight sign of ..., slight state of ..., just right for ...
加わる【くわわる】
to be added to, to be appended, to join in (e.g. a group of friends), to participate, to increase (e.g. heat), to gain in (e.g. influence), to grow, to gather (speed), to be applied (e.g. heat, pressure), to be exerted
加える【くわえる】
to add, to add up, to sum up, to append, to annex, to increase, to gather (e.g. speed), to pick up, to include, to count in, to let join, to inflict (damage), to deal, to give
添加【てんか】
addition, annexing
加速度【かそくど】
acceleration
倍加【ばいか】
doubling, marked increase, multiplying, redoubling
付け加える【つけくわえる】
to add (one thing to another), to add (a few more words, an explanation, etc.)