Google Books Ngram Viewer

Graph these comma-separated phrases:
case-insensitive
between and from the corpus with smoothing of .  
Search in Google Books:

1800 - 1853 1854 - 1944 1945 - 1956 1957 - 1988 1989 - 2000 omelet English
1800 - 1860 1861 - 1927 1928 - 1936 1937 - 1982 1983 - 2000 omelette English

Run your own experiment! Raw data is available for download here.
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