付加詞 is read as ふかし (fukashi) and means adjunct.
ふかし
fukashi
ふかぜい
additional tax
ふか
addition
つけくわえる
to add (one thing to another)
つけくわえ
addition (to something)
ふかはんのう
addition reaction
ふかかち
added value
ふかかちぜい
value-added tax
ふかかちさーびす
value-added service
ふかかちねっとわーく
value-added network
ふかけい
supplementary punishment
ふかかちつうしんもう
ふかぶつりひょうげん
additional physical rendition