-ise vs -ize
Let’s take a look at all the ‘-ise’ and ‘-ize’ words in the Words of Champions list. As a general rule, “-ize” is two times more common than the “-ize” ending where the syllable is pronounced as “eyes”. So if in doubt, guess “-ize”.
However, there are a bunch of interesting pronunciations of this suffix; let’s take a closer look at them:
- The French “-oise” ending – this suffix is pronounced like “was”. Note the pronunciation of Nicoise (audio) and ardoise (audio).
- The French “ise” ending is pronounced “eeze”. Note the pronunciations of chemise (audio) and betise (audio).
- The French “aise” ending is pronounced “ayze”. Note the words malaise (audio), liaise (audio) and praise (audio).
- Another set of exceptions is: tortoise (audio) and treatise (audio).
- And last set of exceptions is: maize (audio) and seize (audio).
This leaves us with 6 “-ise” words:
- merchandise (audio)
- enfranchise (audio)
- contrariwise (audio)
- chastise (audio)
- exercise (audio)
- thwartwise (audio)
And 10 “-ize” words:
- prize (audio)
- lionize (audio)
- monopolize (audio)
- formalize (audio)
- philosophize (audio)
- vandalize (audio)
- galvanize (audio)
- metastasize (audio)
- cauterize (audio)
- cicatrize (audio)
-ify vs -efy
Both suffixes are pronounced “uh-fy”. The good news is that “-ify” is way more common than “-efy”, so if in doubt, guess “-ify”.
In the Words of Champions 2021-22, there is only one word that ends with “-efy”: stupefy (audio).
-ible vs -able
Both suffixes are pronounced “uh-ble”. The words are usually adjectives, but we’ll look at a few notable words that are not adjectives. “-able” is far more common adjective ending and you should guess “-able” if in doubt. Here are the 12 “-ible” words in the Words of Champions. If you memorize these, then you can safely guess “-able” for any adjective ending with this syllable not in this list.
The interesting non-adjective words are (they are all nouns):
The remaining 10 “-ible” words are:
- tangible (audio)
- miscible (audio)
- combustible (audio)
- perceptible (audio)
- persuasible (audio)
- fungible (audio)
- vincible (audio)
- submersible (audio)
- immiscible (audio)
- rescissible (audio)
One helpful trick is that if the root word has a derived word ending with -ion, it will likely go -ible. Thus, because there is a word called combustion, the adjective word would go combustible (not combustable). Similarly,
- perception -> perceptible
- persuasion -> persuasible
- submersion -> submersible
- rescission -> rescissible
Doesn’t work all the time, but it can offer a clue.