Overtime vs over time

Overtime and over time are words that are close in spelling and pronunciation and may be considered confusables. Confusables is a catch-all term for words that are often misused or confused; there are many confusing words in the English language that may be easily confused for each other in spoken English and written English. Two words […]
from Grammarist
https://grammarist.com/confusables/overtime-vs-over-time/