| A | B |
| homonym | one of two or more words pronounced and/or spelled alike but different in meaning |
| homogeneous | 1. of the same or a similar kind #2. of uniform structure or composition throughout |
| homologous | developing from the same or a similar part of a remote ancestor |
| homophone | one of two or more words pronounced alike but different in meaning or derivation or spelling |
| diffraction | 1. the bending or spreading of a beam of light esp. when it passes through a narrow opening or is reflected from a ruled surface #2. similar changes in other waves, such as sound waves |
| dissension | disagreement in opinion |
| disseminate | to spread widely as if by sowing seeds |
| dissipate | 1. to cause to spread out to the point of vanishing; disperse #2. to spend wastefully or foolishly; squander |