One example of a 6-letter animal ending in "r" is "otter." Otters are semiaquatic mammals known for their playful behavior and streamlined bodies adapted for swimming. They are part of the family Mustelidae, which also includes weasels and badgers. Otters are found in freshwater and marine habitats around the world.
fodder! fatter
collar dollar
raunch
Adder (snake) Alligator Ant bear (anteater) Anteater
killer, kilter, kisser
Some six letter words ending in R are:antleranswerbeaverbetterbitterborderbutlerbuttercratercursorcuterfalterfiltergarterhamperhatterhealerheaterhotterjuniorkinderladderlardermurderporterpotter
There could be multiple answers to this. RACISM is one such word starting with R and ending with M.
Gibraltar ends with an r.
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 5 words with the pattern R---OR. That is, six letter words with 1st letter R and 5th letter O and 6th letter R. In alphabetical order, they are: rancor raptor rector rhetor rizzor
spider
appearbrotherchowderdrifteremperorflickerflustergrinderhoarderintegerjanitorlaundrymufflerneitherprinterremoverslenderteachervaulterwhisperyounger
Scarbeardearfeargearhearnearpearrearseartearwearyear.