N3 - 増加ぞうか
increase, addition
N3 - 増すます
to increase, to grow
N2 - 激増げきぞう
sudden increase
N2 - 増減ぞうげん
increase and decrease, fluctuation
N2 - 増やすふやす
to increase, to add to, to augment
N1 - 増強ぞうきょう
augment, reinforce, increase
N1 - 増進ぞうしん
promoting, increase, advance
N1 - 増しまし
extra, additional, less objectionable, better, preferable