The term "powerhouse" typically refers to something or someone that possesses great power, strength, or influence. Therefore, the antonyms for the word "more powerhouse" would be words that signify the opposite of these qualities. Examples of such words include weak, feeble, frail, powerless, insignificant, and ineffective. Alternatively, words such as subordinate, small, insignificant, and lowly can also serve as antonyms for "more powerhouse" since they convey a sense of being relatively less powerful or influential. Whatever the case, using antonyms can help convey a different tone or emotion in communication, depending on the context and the message being conveyed.