From BiblePortal Wikipedia

Vine's Expository Dictionary of NT Words [1]

1: Δώρημα (Strong'S #1434 — Noun Neuter — dorema — do'-ray-mah )

translated "boon" in  James 1:17 , RV, is thus distinguished, as the thing given, from the preceding word in the verse, dosis, "the act of giving" (AV, "gift" in each case); elsewhere in  Romans 5:16 . It is to be distinguished also from doron, the usual word for a gift. See Gift.

Webster's Dictionary [2]

(1): (n.) That which is asked or granted as a benefit or favor; a gift; a benefaction; a grant; a present.

(2): (n.) A prayer or petition.

(3): (n.) Good; prosperous; as, boon voyage.

(4): (n.) Kind; bountiful; benign.

(5): (n.) Gay; merry; jovial; convivial.

(6): (n.) The woody portion flax, which is separated from the fiber as refuse matter by retting, braking, and scutching.