octet (n.)
- antistrophe
- book
- burden
- canto
- chorus
- coaction
- collaboration
- collectivism
- collusion
- commensalism
- communalism
- communism
- community
- complicity
- concert
- concord
- concordance
- concurrence
- cooperation
- cooperativeness
- couplet
- distich
- duet
- duo
- ecumenicalism
- ecumenicism
- ecumenism
- eight
- electron
- envoi
- esprit
- fellowship
- harmony
- line
- measure
- morale
- mutualism
- mutuality
- negatron
- octad
- octagon
- octahedron
- octameter
- octave
- octavo
- octonary
- octosyllable
- ogdoad
- photoelectron
- quartet
- quatrain
- quintet
- reciprocity
- refrain
- septet
- sestet
- sextet
- solidarity
- stanza
- stave
- strain
- strophe
- syllable
- symbiosis
- synergism
- synergy
- teamwork
- tercet
- terzetto
- thermion
- trio
- triplet
- triumvirate
- troika
- verse
