Synonyms for in close collaboration

Synonyms for in

with (per, of, to >>)
through
within

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Synonyms for close

near
shut (close in, close down, shut down >>)
nearby
close up
tight (crowded, dense, stuffy >>)
end
intimate
nigh
narrow
complete
stop
approach
lock (covering, shutting, shutdown >>)
secretive
serried

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Synonyms for collaboration

cooperation (partnership, coordination, relationship >>)
collaborationism

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