Form
Form verb - To take on a definite form.
Join forces and form are semantically related. In some cases you can use "Join forces" instead a verb "Form".
Join forces
Join forces verb - Work together on a common enterprise or project.
Form and join forces are semantically related. Sometimes you can use "Form" instead a verb phrase "Join forces".
Both terms in one sentence
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Revolution: As the first season goes on, the Rebels and the Georgian Federation join forces to form an army of 300 men ("The Night the Lights Went Out in Georgia").
Source: Redshirt Army -
The survivors form The Squad, and join forces with a local resistance named after the Martian Red Faction in an attempt to overthrow Sopot.
Source: Video Game / Red Faction - Individual Orks are naturally hostile to everything else, even each other, but they will form into tribes to fight other tribes, and no matter how much the Ork tribes fight each other, they'll nearly always join forces to fight non-Orks.
Source: Enemy Mine / Tabletop Games
Cite this Source
Join forces and Form. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/form/join_forces
Form & Join forces. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/form/join_forces>.
Join forces or Form. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/form/join_forces.
Google Ngram Viewer shows how "form" and "join forces" have occurred on timeline