- 701 octahedra
- 702 octahedral
- 703 octahedrally
- 704 octahedrite
- 705 octahedron
- 706 octal
- 707 octamerous
- 708 octameter
- 709 octan
- 710 octandrian
- 711 octandrous
- 712 octane
- 713 octangle
- 714 octangular
- 715 octanol
- 716 octans
- 717 octant
- 718 octantal
- 719 octants
- 720 octapeptide
- 721 octapla
- 722 octaploid
- 723 octaploidies
- 724 octaploids
- 725 octaploidy
- 726 octapodic
- 727 octapodies
- 728 octapody
- 729 octarchies
- 730 octarchy
- 731 octaroon
- 732 octas
- 733 octastich
- 734 octastichon
- 735 octastichous
- 736 octastichs
- 737 octastrophic
- 738 octastyle
- 739 octaval
- 740 octavalent
- 741 octave
- 742 octavo
- 743 octennial
- 744 octennially
- 745 octet
- 746 octett
- 747 octette
- 748 octetts
- 749 octillion
- 750 octillionth
- 751 octingenaries
- 752 octingenary
- 753 octingentenaries
- 754 octingentenary
- 755 octocentenaries
- 756 octocentenary
- 757 octodecillion
- 758 octodecimo
- 759 octofid
- 760 octogenarian
- 761 octogenary
- 762 octogynous
- 763 octohedra
- 764 octohedron
- 765 octonarian
- 766 octonaries
- 767 octonarii
- 768 octonarius
- 769 octonary
- 770 octonocular
- 771 octopetalous
- 772 octopi
- 773 octoploid
- 774 octopod
- 775 octopodous
- 776 octopods
- 777 octopus
- 778 octopush
- 779 octopusher
- 780 octopushes
- 781 octoroon
- 782 octosepalous
- 783 octostichous
- 784 octostyle
- 785 octosyllabic
- 786 octosyllable
- 787 octothorp
- 788 octroi
- 789 octuor
- 790 octuple
- 791 octupled
- 792 octuples
- 793 octuplet
- 794 octuplex
- 795 octuplicate
- 796 octupling
- 797 octuply
- 798 octyl
- 799 ocular
- 800 ocularist