succor / sucker are similar-sounding terms with different meanings (referred to as homophones). To better understand the differences, see below for definitions, pronunciation guides, and example sentences using each term. 👇
succor: (verb) help in a difficult situation.
sucker: (noun) a shoot arising from a plant's roots. (noun) a drinker who sucks (as at a nipple or through a straw). (noun) flesh of any of numerous North American food fishes with toothless jaws. (noun) an organ specialized for sucking nourishment or for adhering to objects by suction. (noun) mostly North American freshwater fishes with a thick-lipped mouth for feeding by suction; related to carps.
succor: s·AH·k·er
sucker: s·AH·k·er
(Examples are Wikipedia snippets under the CC ShareAlike 3.0 license. Definitions drawn from WordNet.)