Languid, languishing, languorous, lackadaisical, listless, spiritless, enervated are comparable when they mean lacking in vim or energy or, when applied to things, the appearance of it.
Language vs Vocabulary vs Phraseology vs Phrasing vs Diction vs Style
Language, vocabulary, phraseology, phrasing, diction, style are comparable rather than synonymous terms when they mean oral or written expression or a quality of such expression that is dependent on the variety, or arrangement, or expressiveness of words.
Language vs Dialect vs Tongue vs Speech vs Idiom
Language, dialect, tongue, speech, idiom are comparable when they denote a body or system of words and phrases used by a large community (as of a region) or by a people, a nation, or a group of nations.
Lack vs Want vs Dearth vs Absence vs Defect vs Privation
Lack, want, dearth, absence, defect, privation are comparable when denoting the fact or state of being without something.
Lack vs Want vs Need vs Require
Lack, want, need, require are comparable when meaning to be without something, especially something essential or greatly to be desired.
Knowledge vs Science vs Learning vs Erudition vs Scholarship vs Information vs Lore
Knowledge, science, learning, erudition, scholarship, information, lore are comparable when they mean what is known or can be known, usually by an individual but sometimes by human beings in general.
Kingly vs Regal vs Royal vs Queenly vs Imperial vs Princely
Kingly, regal, royal, queenly, imperial, princely are comparable when meaning of, relating to, or befitting one who occupies a throne.
Kind vs Kindly vs Benign vs Benignant
Kind, kindly, benign, benignant mean having or exhibiting a nature that is gentle, considerate, and inclined to benevolent or beneficent actions and are comparable especially as applied to persons and to their acts and utterances.
Kill vs Slay vs Murder vs Assassinate vs Dispatch vs Execute
Kill, slay, murder, assassinate, dispatch, execute are comparable when meaning to deprive of life or to put to death.
Keep vs Keep back vs Keep out vs Retain vs Detain vs Withhold vs Reserve vs Hold vs Hold back
Keep, keep back, keep out, retain, detain, withhold, reserve, hold, hold back are comparable in meaning not to let go from one's possession, custody, or control.
Keep vs Observe vs Celebrate vs Solemnize vs Commemorate
Keep, observe, celebrate, solemnize, commemorate are comparable when they mean to pay proper attention or honor to something prescribed, obligatory, or demanded (as by one's nationality, religion, or rank), but they vary widely in their range of reference or application.
Justify vs Warrant
Justify, warrant are comparable when meaning to be the thing (as evidence, a circumstance, a situation, or a state of affairs) that constitutes sufficient grounds for doing, saying, using, or believing something.