penni / penny 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. 👇
penni: (noun) 100 pennia formerly equaled 1 markka in Finland.
penny: (noun) a fractional monetary unit of Ireland and the United Kingdom; equal to one hundredth of a pound. (noun) a coin worth one-hundredth of the value of the basic unit.
penni: NA
penny: p·EH·n·iy
(Examples are Wikipedia snippets under the CC ShareAlike 3.0 license. Definitions drawn from WordNet.)