If you are not a charity, do not call it a donation. Call it a tip.
That may be relevant to people seriously monetizing their hobbies.
(Whether something is, for tax purposes, a tip or a donation is determined by the reason the money is given, not what you call it, but if it's truly a donation then I'd be inclined to call it one just in case that influences some judgement further down the line.)
These days, there are other monetization products but I'm not sure the IRS would approve of you calling it whatever you want for reasons of avoiding taxes.
Tip signals "payment for my work." Donation signals "gift."
People seem to be more inclined to actually fork over a few bucks if you signal "This is my work. I deserve to be paid for it." than if you signal "I would like gifts (or charity) from random internet strangers."
Also, when you start expecting your project to meet income requirements, it can take the fun out extremely fast. Part of the fun is being able to work on it as much or as little as I want.
Benefits of monetizing (from my experience):
Extremely validating, what you enjoy doing has value to others.
Offsets costs, even if your only cost is time, a few bucks really helps.