tôt -- early in an absolute sense.
en avance -- ahead of a schedule.

I find that DeepL is generally a better translator than google. Both make errors though so continue to be wary/question them. 

As Chris notes, there is a difference here, and it requires context to differentiate. I have never yet seen an online translator give the “answer” most commonly heard in France to questions of translation, grammar, culture, politics etc - “Ça dépend”.