| Text | Length |
| Observation, Part 4 | 19 |
| Observation, part 5 | 19 |
| Observation, part 6 | 19 |
| Observation: Part 1 | 19 |
| Observation: Part 2 | 19 |
| Observation: Part 3 | 19 |
| Observation: Part 4 | 19 |
| Observational | 13 |
| Observations | 12 |
| Observatories do it | 19 |
| Observatory doings | 18 |
| Observatory find | 16 |
| Observatory problem | 19 |
| Observatory roof | 16 |
| Observatory sights | 18 |
| Observatory site | 16 |
| Observatory site? | 17 |
| Observatory subj. | 17 |
| Observatory tool | 16 |
| Observe again | 13 |
| Observe anew | 12 |
| Observe Arbor Day | 17 |
| Observe better | 14 |
| Observe carefully | 17 |
| Observe closely | 15 |
| Observe covertly | 16 |
| Observe furtively | 17 |
| Observe intently | 16 |
| Observe Lent | 12 |
| Observe narrowly | 16 |
| Observe orally | 14 |
| Observe Ramadan | 15 |
| Observe secretly | 16 |
| Observe the rules | 17 |
| Observe the Sabbath | 19 |
| Observe Yom Kippur | 18 |
| Observe, as advice | 18 |
| Observed attending | 18 |
| Observed carefully | 18 |
| Observed casually | 17 |
| Observed critically | 19 |
| Observed in the act | 19 |
| Observed intently | 17 |
| Observed Lent | 13 |
| Observed rigorously | 19 |
| Observed secretly | 17 |
| Observed visiting | 17 |
| Observed Yom Kippur | 19 |
| Observed, to Tweety | 19 |
| Observer of rules | 17 |
| Observes carefully | 18 |
| Observes covertly | 17 |
| Observes Lent | 13 |
| Observes Ramadan | 16 |
| Observes secretly | 17 |
| Observes with care | 18 |
| Observes Yom Kippur | 19 |
| Observes: Slang | 15 |
| Observing carefully | 19 |
| Observing Faith? | 16 |
| Observing one | 13 |
| Observing Ramadan | 17 |
| Observing things | 16 |
| Obsessed about | 14 |
| Obsessed aficionado | 19 |
| Obsessed captain | 16 |
| Obsessed group | 14 |
| Obsessed mariner | 16 |
| Obsessed one | 12 |
| Obsessed over | 13 |
| Obsessed person | 15 |
| Obsessed skipper | 16 |
| Obsessed whaler | 15 |
| Obsessed with | 13 |
| Obsessed, in a way | 18 |
| Obsession source? | 17 |
| Obsession, e.g. | 15 |
| Obsession, for one | 18 |
| Obsessions: Fr. | 15 |
| Obsessive about | 15 |
| Obsessive cleaners? | 19 |
| Obsessive collector | 19 |
| Obsessive critter | 17 |
| Obsessive idea | 14 |
| Obsessive observer | 18 |
| Obsessive sailor | 16 |
| Obsessive seducer | 17 |
| Obsessive thought | 17 |
| Obsessive type | 14 |
| Obsessive whaler | 16 |
| Obsessive, say | 14 |
| Obsidian source | 15 |
| Obsidian, e.g. | 14 |
| Obsidian, once | 14 |
| Obsolescence | 12 |
| Obsolescent dealers | 19 |
| Obsolescent disks | 17 |
| Obsolescent eatery | 18 |
| Obsolescent emporia | 19 |
| Obsolescent file | 16 |
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