I have seen both the word "fusional" and the words "inflectional"/"flectional" used as the counterparts of "agglutinative" when describing a morphological process.
1) Is there a distinction between fusional and (in)flectional (as it relates to morphological types), or is fusional simply a more modern terminological equivalent of the latter?
2) Does the term fusional include the concept of "stem classes", or is there a separate term for that?
For example, Latin has a different genitive singular ending for consonant stems (e.g. hominis "of the person") versus a- and o- stems (agricolae "of the farmer"), but to call these affixes "fusional" would seem to suggest that they combine (i.e., fuse) different morphological functions, when in fact they seem to constitute a "splitting" of the same morphological function (genitivity) into different forms, based on the final stem-vowel (or lack thereof) of a given word.
By contrast, an affix like the Greek genitive plural ending -ōn (as in andrôn "of the men", etc.) seems more appropriately described as "fusional", because this ending combines the two categories of genitivity and plurality but is not separable into two distinct morphemes.
Would the term "fusional" nonetheless be used to describe the variation in the Latin genitive singular between -is and -e/-i?
Thanks for any help