| Synonyms | Length | Vowels | Syllables | |
|---|---|---|---|---|
| Astronomical Observatory | 24 | 15 | 9 | 10 |
| Astronomical Telescope | 22 | 13 | 9 | 8 |
| Coelostat | 9 | 5 | 4 | 3 |
| Coronagraph | 11 | 7 | 4 | 4 |
| Coronograph | 11 | 7 | 4 | 4 |
| Gregorian Telescope | 19 | 11 | 8 | 7 |
| Heliostat | 9 | 5 | 4 | 4 |
| Lookout | 7 | 3 | 4 | 2 |
| Lookout Station | 15 | 8 | 7 | 4 |
| Newtonian Reflector | 19 | 12 | 7 | 7 |
| Newtonian Telescope | 19 | 11 | 8 | 7 |
| Oao | 3 | 0 | 3 | 2 |
| Observation Tower | 17 | 10 | 7 | 6 |
| Observatory | 11 | 7 | 4 | 5 |
| Orrery | 6 | 4 | 2 | 3 |
| Oso | 3 | 1 | 2 | 2 |
| Planetarium | 11 | 6 | 5 | 5 |
| Prism Spectroscope | 18 | 13 | 5 | 5 |
| Radar Telescope | 15 | 9 | 6 | 5 |
| Radio Observatory | 17 | 10 | 7 | 8 |
| Radio Reflector | 15 | 9 | 6 | 6 |
| Radio Telescope | 15 | 8 | 7 | 6 |
| Reflecting Telescope | 20 | 13 | 7 | 6 |
| Reflector | 9 | 6 | 3 | 3 |
| Scope | 5 | 3 | 2 | 1 |
| Spectrogram | 11 | 8 | 3 | 3 |
| Spectrograph | 12 | 9 | 3 | 3 |
| Spectroheliograph | 17 | 11 | 6 | 6 |
| Spectrohelioscope | 17 | 10 | 7 | 6 |
| Spectroscope | 12 | 8 | 4 | 3 |
| Telescope | 9 | 5 | 4 | 3 |

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