| Term | Definition |
| homochromatic | having the same color; unicolor |
| heterochromatic | having different colors |
| homogenous | of the same kind; similar; uniform |
| heterogenous | differing in kind; dissimilar; varied |
| homology | similarity in structure |
| heterology | dissimilarity in structure |
| homomorphic | exhibiting similarity of form |
| heteromorphic | exhibiting diversity of form |
| homonym | word that sounds like another but differs in meaning and spelling |
| homocentric | having the same center; concentric |
| homophonic | having the same sound or voice (ant. polyphonic) |
| heteroclite | deviating from the common rule; abnormal; atypical |
| heteroclite | person or thing deviating from the common rule |
| heterodox | opposed to accepted beliefs or established doctrines, especially in religion; unorthodox (ant. orthdox) |