tenser / tensor 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. 👇
tenser: (adjective) in or of a state of physical or nervous tension. (adjective) pronounced with relatively tense tongue muscles (e.g., the vowel sound in `beat'). (adjective) taut or rigid; stretched tight.
tensor: (noun) a generalization of the concept of a vector. (noun) any of several muscles that cause an attached structure to become tense or firm.
tenser: NA
tensor: NA
(Examples are Wikipedia snippets under the CC ShareAlike 3.0 license. Definitions drawn from WordNet.)