Here are some examples of words with the suffix "-ier":
* Stronger (strong)
* Bigger (big)
* Faster (fast)
* Taller (tall)
* Happier (happy)
* Sillier (silly)
* Cleverer (clever)
* Hotter (hot)
* Cooler (cool)
* Older (old)
* Younger (young)
* Nicer (nice)
* Easier (easy)
* Dirtier (dirty)
* Crazier (crazy)
Keep in mind that some adjectives have irregular comparative forms and don't use "-ier". For example, good becomes "better" and bad becomes "worse".