| Text | Length |
| OPEC | 4 |
| Opéra-___ | 12 |
| Opéra division | 17 |
| Opaquely white | 14 |
| Opaque-glazed earthenware pieces | 32 |
| Opaque, in a way | 16 |
| Opaque watercolors | 18 |
| Opaque watercolor technique | 27 |
| Opaque vase material | 20 |
| Opaque painting style | 21 |
| Opaque material used in vases, e.g. | 35 |
| Opaque gemstone | 15 |
| Opaque gems | 11 |
| Opaque gem | 10 |
| Opaque eye layer | 16 |
| Opaque drinking vessel | 22 |
| Opaque clouds, to meteorologists | 32 |
| Opaque campaign supporters, briefly | 35 |
| Opaque barite | 13 |
| Opaque | 6 |
| Opals and rubies | 16 |
| Opals and emeralds | 18 |
| Opalescent ocean find | 21 |
| Opalescent gems | 15 |
| Opalescent gem | 14 |
| Opalescent | 10 |
| Opal, essentially | 17 |
| Opal's mo. | 14 |
| Opal suffix | 11 |
| Opal or topaz | 13 |
| Opal or petal suffix | 20 |
| Opal or onyx | 12 |
| Opal or garnet | 14 |
| Opal mos. | 9 |
| Opal finish? | 12 |
| Opal ending | 11 |
| Opal and onyx | 13 |
| Opal alternative | 16 |
| Opal | 4 |
| Opahs and sego lilies | 21 |
| Opacity in the cornea | 21 |
| Opacates | 8 |
| Opacate | 7 |
| Opa-___, Florida | 16 |
| Opa-___, Fla. | 13 |
| Opa-__, FL | 10 |
| Opa- --, Florida | 16 |
| Op. ____ (footnote abbr.) | 25 |
| Op. ___ (in the work cited) | 27 |
| Op. ___ (footnote abbr.) | 24 |
| Op. ___ | 7 |
| Op. __: footnote abbr. | 22 |
| Op. __ (footnote notation) | 26 |
| Op. __ | 6 |
| Op. or loc. follower | 20 |
| Op. --. (where mentioned) | 25 |
| Op. -- (abbr. in a footnote) | 28 |
| Op-ed, typically | 16 |
| Op-ed's offering | 20 |
| Op-Ed pieces | 12 |
| Op-ed piece, usually | 20 |
| Op-Ed piece, e.g. | 17 |
| Op-ed piece | 11 |
| Op-ed page feature | 18 |
| Op-ed page concerns | 19 |
| Op-ed page apology? | 19 |
| Op-ed offerings | 15 |
| Op-ed offering | 14 |
| Op-ed column, e.g. | 18 |
| Op-ed artist Pat | 16 |
| Op-Ed article | 13 |
| Op-artist of Marilyn | 20 |
| Op-artist Bridget | 17 |
| Op-art design | 13 |
| Op- -- | 6 |
| Op, so to speak | 15 |
| OP's forerunners | 20 |
| Op ____: in the work cited | 26 |
| Op ___ (in the work referenced) | 31 |
| Op ___ (in the work cited) | 26 |
| Op ___ (footnote abbr.) | 23 |
| Op ___ | 6 |
| Op or pop follower | 18 |
| Op or Pop | 9 |
| Op opener | 9 |
| Op artist Bridget | 17 |
| Op artist Albers | 16 |
| Op art viewer's cry, maybe | 30 |
| Op Art pattern | 14 |
| Op Art and Pop Art | 18 |
| Oozy tree output | 16 |
| Oozy stuff | 10 |
| Oozy sediment | 13 |
| Oozy roofing material | 21 |
| Oozy roof goop | 14 |
| Oozy road material | 18 |
| Oozy place | 10 |
| Oozy muck | 9 |
| Oozy mixtures | 13 |
| Oozy horror film menace | 23 |
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