請問"waiting instruction" and "awaiting intruction"用法有何不同?

The verb "wait" is normally expressed as an intransitive verb. In contrary, the verb "await" is always expressed as a transitive verb; that is, it must take a direct object.

~ "awaiting instruction" 等候指令 is a correct participle phrase, where "instruction" is the direct object of the participle "awaiting" 等候指令
~ "waiting instruction" 在等候中的指令 the participle "waiting" acts as an adjective modifying the noun "instruction"