Another word for causing no harm is "benign." This term typically describes something that is gentle and not likely to cause injury or damage. It can be used in various contexts, such as medical conditions or environmental impacts, to indicate a lack of negative effects.
Suitable suffixes for the word harm:harmsharmingharmedharmlessharmlesslyharmfulharmfullyharmer
causing harm or damage
don't think about it
quadruple
Bete queste
fare
Enclosure.
Anouther word for "practical joke" = Prank
Better; expand; grow.
software.
Anouther name for foundation is the word base.
This looks like a version of the verb to injure (to harm). It could be:injuries (plural of noun injury) - harm suffered, or physical harminjurers (plural persons) - persons causing harminjurious (adjective) - something causing harm or damage