'ar'—denotes a collection or reunion of certain things:

vorto = a word, vort'ar'o = a dictionary.
homo = a man, hom'ar'o = mankind.

'ĉj'—inserted between 1-5 letters of a masculine name
denotes a term of endearment:

Johano = John, Jo'ĉj'o = Jack, Johnnie.
Ernesto = Ernest, Erne'ĉj'o = Ernie.

'ebl'—denotes possibility, something likely to happen:

legi = to read, leg'ebl'a = legible.
kredi = to believe, kred'ebl'a = credible.

'ec'—denotes an abstract quality (similar to the English suffix "ness"):

bona = good, bon'ec'o = goodness.
pura = clean, pur'ec'o = cleanliness.

'eg'—denotes augmentation, intensity of degree:

granda = great, grand'eg'a = enormous.
pafilo = gun, pafil'eg'o = cannon.

'ej'—denotes the place specially used for or allotted to:

dormi = to sleep, dorm'ej'o = a dormitory.
lerni = to learn, lern'ej'o = a school.