Ответ:

children, men, women, wives, knives, halves, mice, geese, teeth, feet, elves, loaves, leaves, knives.

potatoes, tomatoes, pianos, cacti,  mediums or media, phenomena, categories, syllabi or syllabuses, analysis, theses, diagnosis, crises, nuclei, criteria.

toes, data, foxes, lilies, dishes, wrenches, geese, flashes, deer, sheep, reefs, dwarfs, churches, diaries.