[agrostis]

Bottom line: native speakers of English don't grok morphology. When exposed to it, the best among them get fascinated and keen, the worst are cast into despair and ennui. But hey, this way of dealing with words is quite common as languages go. Greek, Arabic, Russian, Turkish, Swahili, all of them work by affixing lots of grammar markers onto roots, sometimes changing the roots and the affixes in subtle ways. (Actually, English used to be like that, too, no more than a thousand years ago.)