Looking on the internet deeply has found these results:

groupmate is the most popular phrase on the web.

group mate 1117,000 results on the web	groupmate 1275,000 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
No don't, mate, no, no, what about all the work you've been doing, all the stuff, all the changes you've been going through in class. Group. These hamsters were spirited away by a campaign group for the protection and preservation of this species who believed that, if they abducted the hamsters, they could get them to mate. They were evolved for a world in which people lived in very small groups, rarely met anybody who was terribly different from themselves, had rather short lives in which there were few choices and the highest priority was to eat and mate today.	It doesn't look like this phrase is very popular! The search could not find any examples on the internet.

group mate

1117,000 results on the web

groupmate

1275,000 results on the web

More popular!

No don't, mate, no, no, what about all the work you've been doing, all the stuff, all the changes you've been going through in class. Group.
These hamsters were spirited away by a campaign group for the protection and preservation of this species who believed that, if they abducted the hamsters, they could get them to mate.
They were evolved for a world in which people lived in very small groups, rarely met anybody who was terribly different from themselves, had rather short lives in which there were few choices and the highest priority was to eat and mate today.

It doesn't look like this phrase is very popular! The search could not find any examples on the internet.