Correlation Coefficient of Words
R, 63 bytes
s=strsplit(scan(,&quot;&quot;),&quot;&quot;)[[1]];cor(match(s,letters),1:length(s))

Ungolfed :
#Takes the input and splits it, letters by letters
s=strsplit(
           scan(,&quot;&quot;), 
           &quot;&quot;)[[1]];

#Finds the positions of each letters in the lowercase alphabet, and correlates them with
#their position in the word
cor(
    match(s,letters),
    1:length(s)
    )