1.insure(verb): to guarantee against loss
Synonyms: assure,cover
Antonyms: endanger,lay bare
Example Sentence: “I should not like to insure her againstdoing that,” said the boatswain.
2.interface(noun): a surface regarded as the common boundary of two bodies, spaces,
Synonyms: admix,alloy
Antonyms: disconnect,disjoin
Example Sentence: There remains the question of theprecipitation of the tanning colloid at theinterface.
3.issue(noun): the act of sending out
Synonyms: affair,argument
Antonyms: agreement,harmony
Example Sentence: Must the family of the Plyants be utterlyextinct for want of issue male?
4.keen(adjective): finely sharpened, as an edge; so shaped as to cut
Synonyms: anxious,ardent
Antonyms: apathetic,calm
Example Sentence: The pinch was felt at other points, andthere the Confederate sympathy waskeen.
5.keep(verb): to hold
Synonyms: carry,conduct
Antonyms: displace,fail
Example Sentence: Not to admire, is all the art I know, Tomake men happy, and to keep them so.