collaborate (v.)

• accord
• acquiesce
• affiliate
• agree
• ally
• amalgamate
• associate
• author
• band
• coact
• coalesce
• coincide
• collude
• combine
• compose
• concert
• concord
• concur
• confederate
• conjoin
• connive
• consent
• consolidate
• conspire
• cooperate
• correspond
• editorialize
• federate
• formulate
• fraternize
• fuse
• ghost
• ghostwrite
• harmonize
• incline
• indite
• join
• league
• lean
• merge
• novelize
• partner
• prepare
• produce
• reciprocate
• synchronize
• unite
• write