Correspondence (source) ; Individual sources ; Worthäufigkeit; Häufigkeitsliste; Frequency list; Frequency (lex.) ; Word frequency ; Form of address ; Sprachwandel (pragm.) ; Language change (pragm.) ; Sprachgebrauchswandel; Deictification; Subjektivierung; Subjectification; Pragmatic change ; Lemmata ; Text comparison ; Middle English