Bound
Part of speech: verb
Definition: To tie; to confine by any ligature. To surround a territory or other geographical entity. To be the boundary of. To leap, move by jumping.
Part of speech: noun
Definition: A boundary, the border which one must cross in order to enter or leave a territory. a value which is known to be greater or smaller than a given set of values A sizeable jump, great leap.
Part of speech: adjective
Definition: Obliged (to). Very likely (to). That cannot stand alone as a free word. Constrained by a quantifier. ready, prepared. ready, able to start or go (to); moving in the direction (of).
Example sentence: Surplus wealth is a sacred trust which its possessor is bound to administer in his lifetime for the good of the community.
Certain
Part of speech: determiner
Definition: Having been determined but unspecified. The quality of some particular subject or object which is known by the speaker to have been specifically singled out among similar entities of its class.
Part of speech: adjective
Definition: Sure, positive, not doubting.
Example sentence: I am certain of nothing but the holiness of the heart's affections, and the truth of imagination.