| brace(noun, set, combination, division, match) |
| couple(noun, division, match, double, pair) |
| duo(noun, set, combination, match, couple) |
| pair(noun, accompaniment, two, duality) |
| span(noun, set, combination, division, match) |
| twosome(noun, set, combination, match, couple) |
| yoke(noun, set, combination, match, couple) |
| couplet(noun, duality) |
| duet(noun, accompaniment, duality) |
| distich |
| twain |
| two(noun, combination, match, double, couple) |
| doublet(noun, set, combination, match, double) |
| duad |
| duality(noun, combination, division, match, opposition) |
| match(noun, combination, couple, duality, duo) |
| mates(noun, combination, match, couple, duo) |
| amoeba(noun, microorganism) |
| bacteria(noun, microorganism) |
| germ(noun, microorganism) |