adjectival nouns or quasi-adjectives (keiyodoshi)noun (common) (futsuumeishi) only applies to ちょうほう convenient;useful;handy;helpful

noun (common) (futsuumeishi)noun or participle which takes the aux. verb surutransitive verb only applies to ちょうほう finding useful;coming in handy;using often

noun (common) (futsuumeishi) (priceless) treasure

Shigetaka