The word "ha'" is often used to express laughter or amusement. However, for those who may want to vary their use of this expression, there are several synonyms that can be used. For instance, "lol" can be used to indicate laughter, "hehe" to express amusement, or "haha" to denote a chuckle. Other synonyms include "giggle", "snicker", "chortle" and "snort". Though they all evoke a sense of amusement, each word differs in how they express it. Ultimately, choosing the right synonym will depend on the context in which one intends to use it and the level of amusement they want to convey.