The suffix "-able" changes "sing" into "singable".
An example of suffix is adding cycle to motor which creates motorcycle.
Other Word Forms
Origin of suffix
- New Latin suffīxum from Latin neuter of suffīxus past participle of suffīgere to fasten underneath, affix sub- sub- fīgere to fix, fasten dhīgw- in Indo-European roots
From American Heritage Dictionary of the English Language, 5th Edition