
1) Actor who shares the lead 2) Bacall, to Bogart, at times 3) Bill sharer 4) Bill splitter 5) Billing partner 6) Billing splitter 7) Credit sharer 8) Crosby to hope, often 9) Curtain-call sharer 10) Fellow leading actor 11) Fellow leading performer 12) Fellow player 13) Fontanne, to Lunt 14) Have equal billing
Found on
https://www.crosswordclues.com/clue/costar

Corrective Optics Space Telescope Axial Replacement, corrective optics for the Hubble Space Telescope
Found on
http://www.translationdirectory.com/glossaries/glossary142.htm
No exact match found.