The Nuance Difference: "洗います" vs "役に立つ"

In Japanese, both 洗います and 役に立つ are often translated to English but have distinct usages. 洗います (あらいます (araimasu)) represents "to wash" (Level: N5) and typically represents Polite form of 洗う. On the other hand, 役に立つ (やくにたつ (yaku ni tatsu)) translates to "to be useful, to be helpful" (Level: N4) and is used for A set phrase meaning to be useful or helpful for someone or something. It describes the utility of an object, skill, or person. Often followed by the particle に. Mixing these up can sound unnatural to native Japanese speakers!