成 is built from the 戈 (halberd) and 刀 components.
It belongs to a phonetic family with 盛, 城, and 誠 — they share the 成 component and the reading セイ.
A common word using 成 is 完成 (かんせい), meaning “complete, completion; perfection”.
Kanji that look similar include 伐, 戒, and 茂.