軟材 is read as なんざい (nanzai) and means softwood.
なんざい
nanzai
なんか
blanching (of vegetables; by depriving them of light)
なんちゃくりく
soft landing
なんじゃく
weakness
なんこつ
cartilage
なんしき
soft (esp. of softball, tennis, etc.)
なんきん
house arrest
なんちょう
soft (tone, focus) (photography)
なんとう
soft pitch
なんたいどうぶつ
mollusc
なんしきやきゅう
Japanese version of baseball played with a hard rubber ball
なんぶんがく
love story
なんしきひこうせん
non-rigid airship