The study contains an analysis of about 250 spontaneously coined -er-d
erivations of a German child between 2.0 and 4.11. The problem is addr
essed how the lexical entry for the -er-suffix is acquired. During the
third year, there is no difference in the amount of deverbal compared
with denominal derivations. However, during the fourth and fifth year
, the amount of deverbal derivations increases rapidly. From the third
year on, the child prefers Agent Noun readings over Instrument Noun r
eadings. Result Noun readings are produced from the fifth year on. The
se findings are discussed with reference to recent theories on lexical
acquisition and acquisition of word formation.