Latin had a system of diminutive suffixes which could be added to words in order to indicate something small or something charming and nice.
paulus: small - paululus: very small, teeny-tiny
os: mouth - osculum: kiss
liber: book - libellus: little book
saccus: bag, pouch - saccellus: little bag, tiny pouch
malleus: hammer - malleolus: little hammer
gladius: sword - gladiolus: little sword