Phonosemantic compound. 貝 represents the meaning and 卉 represents the sound. Based on the original meaning "adornment". The current meaning is a phonetic loan.
賁 and 犇 don't sound similar in modern Mandarin due to historical phonetic changes. They were more similar in older Chinese.賁 /*pˤur/, /*por-s/, /*[b]ur/ 犇 /*pˤur/
Due to historical stylistic changes, this component is less similar to 犇 than it was in ancient scripts.