Two words for working together are cooperate or collaborate.
Collaboration - work together
to work together.to gather up in a group
Cooperate.
Another word for grin teeth together would be grit.
Another word for sitting together could be lounge or gather.
Another word for work partner is colleague.
Work
in addition to,and,plus,with,together with
Together
Another word could be specialty or best work
A word meaning "to come together" is join.
alike together?