A Wordnet from the Ground Up

5.2. plWordNet at Three 171The total number of LUs described in plWordNet 1.0 is a little above the rangedeclared in the project proposal (15–25 thousand LUs). It compares quite favourablywith the wordnets created during the second phase of the EuroWordNet [EWN] project(Vossen et al., 1999, p. 7). We selected the older versions of the correspondingwordnets: they were created from scratch (like plWordNet), and the EWN 2.0 projectlasted several years (like plWordNet). The comparison must be taken with a grain ofsalt, because both the EWN project and the plWordNet project had also goals otherthan the construction of a wordnet (consider the alignment of wordnets in the former,and automatic methods in the latter). Still, it is more appropriate than a comparison towordnets developed over a much longer period. The relation between plWordNet andthe contemporary wordnets is briefly described at the end of this section.Czech WN Estonian WN French WN German WNSynsets LUs Synsets LUs Synsets LUs Synsets LUsNouns 9727 13829 5028 8226 17826 24499 9951 13656Verbs 3097 6120 2650 5613 4919 8310 5166 6778All 12824 19949 7678 13839 22745 32809 15132 20453Table 5.2: Selected counts for Czech, Estonian and German wordnets built in the second phase of theEuroWordNet project (Vossen et al., 1999, p. 7)Facts about the Czech, Estonian, French and German wordnets, built in the secondphase of the EWN project, appear in Table 5.2. The nominal part of plWordNet islarger than in the Estonian wordnet, similar in size to the Czech and German wordnets,and significantly smaller only than the French wordnet, whose construction was basedon an extensive translation of PWN. The verbal part of plWordNet is smaller thanin any of the EWN wordnets. The reason is that the semi-automatic expansion wasperformed mainly on the nominal part. In 1.51 person-months, we added 60% lemmasand 40% LUs; every element was added and verified by two linguists. The EWNwordnets did not, in practice, include LUs other than nominal and verbal units, whileplWordNet contains 3881 adjectival LUs. It should be emphasized, however, that allEWN wordnets are aligned with PWN 1.5 (via a subset of synsets used as a form ofinter-lingua). Alignment with PWN was not a research goal in the plWordNet project.Including Monosemous Lemmas Excluding Monosemous LemmasplWordNet PWN 3.0 plWordNet PWN 3.0Nouns 1.317 1.24 2.361 2.79Verbs 1.286 2.17 2.390 3.57Adjectives 1.472 1.40 2.749 2.71Table 5.3: Average polysemy in plWordNet and PWN 3.0