Here are some words that end with "-ard":
* drunkard: a person who habitually drinks too much alcohol
* coward: a person who is habitually afraid
* laggard: a person who is habitually slow
* wizard: a person who is habitually skilled in magic
* blackguard: a scoundrel, a person who is habitually dishonest or immoral
* blizzard: a severe snowstorm (this word is an exception to the "habitual" meaning)
Let me know if you had another suffix in mind!