§ 227. The full extent of the OE vocabulary is not known to present-day scholars. There is no doubt that many words have not been recorded in the extant texts at all. The evidence of the records has been supplemented from other sources: from the study of the words of closely related OG languages and from later, more extensive ME texts.
Modern estimates of the total vocabulary of OE range from about thirty thousand words to almost one hundred thousand (A. I. Smirnitsky, M. Pei), — the latter figure being probably too high and unrealistic. (Among other causes the differences in the estimates depend on the treatment of polysemy and homonymy. But even the lowest estimates show that OE had already developed about as many words as used by a present-day cultured English speaker.) Despite the gaps in the accessible data, philological studies in the last centuries have given us a fairly complete outline of the OE vocabulary as regards its etymology, word structure, word-building and stylistic differentiation.
ETYMOLOGICAL SURVEY OF THE OLD ENGLISH VOCABULARY
§ 228. Examination of the origin of words is of great interest in establishing the interrelations between languages and linguistic groups. Word etymology throws light on the history of the speaking community and on its contacts with other peoples.
The OE vocabulary was almost purely Germanic; except for a small number of borrowings, it consisted of native words inherited from PG or formed from native roots and affixes.