Cognate spelling shifts between English and French, endings only, no accents:
- a -> e (banana -> banane, antenna -> antenne, spatula -> spatule)
- ade = ade (parade, marmalade,
- al = al (local, diagonal, facial, fatal, canal, moral, verbal, municipal) -- careful, some -al change to -el instead
- al -> el (manual -> manuel, official -> officiel, sensual -> sensuel)
- ant = ant (restaurant, important, distant, vacant, vibrant)
- ary -> aire (vocabulary -> vocabulaire, anniversary -> anniversaire, dictionary -> dictionnaire)
- ble = ble (possible, probable, terrible, variable)
- ent = ent (client, excellent, absent, accent, accident) -- careful, some -ent change to -ant instead
- ent -> ant (absorbent -> absorbant, consistent -> consistant, persistent -> persistant)
- ce = ce (ambulance, arrogance, substance, intelligence, importance)
- ian -> ien (musician -> musicien, optician -> opticien, Italian -> italien, Canadian -> canadien)
- in = in (cousin, bulletin, assassin) -- this one's iffy, some -in become -ine as well
- ine = ine (machine, discipline, famine, marine, routine)
- ing -> ant (charming -> charmant, amusing -> amusant, insulting -> insultant)
- ion = ion (nation, conversation, invitation, religion, variation, transformation)
- ic -> ique (pacific -> pacifique, automatic -> automatique, fantastic -> fantastique)
- ical -> ique (classical -> classique, historical -> historique, typical ->typique)
- id -> ide (candid -> candide, avid -> avide, liquid -> liquide, humid -> humide)
- ide = ide (guide, homicide, suicide)
- ive -> if, ive = ive for feminine form (active -> actif / active, positive -> positif / positive)
- ist -> iste (artist -> artiste, optimist -> optimiste, pessimist -> pessimiste)
- or -> eur (actor -> acteur, instructor -> instructeur, doctor -> docteur)
- ory -> oire (history -> histoire, accessory -> accessoire, victory -> victoire)
- ous -> eux (joyous -> joyeux, furious -> furieux, ambitious -> ambitieux, nervous -> nerveux)
- sm -> sme (optimism -> optimisme, criticism -> criticisme, enthusiasm -> enthusiasme)
- ty -> té (activity -> activité, curiosity -> curiosité, integrity -> integrité)
- ude = ude (attitude, gratitude, latitude, longitude, solitude)
- ure = ure (nature, culture, cure, fracture, texture)
- y -> ie (battery -> batterie, copy -> copie, sympathy -> sympathie, parody -> parodie)
A lot of cognates in French are not even purely academic words because English has such a long history of borrowing straight from French instead of going mostly through Latin, so they will be especially handy for conversation. For the exercises I am picking mostly words like that; as you can see from the above examples, those are not rarefied words.
Somebody asked about this in my log as well, so I'll make up an exercise there and point you to it when it's done.