Speculating is it is how many times the key phrase shows up in all content. The keywords are Faith and Reaper and the phrase is Faith Reaper.
TMI . . .
(Story Setting: Cup'pa of fresh coffee, just awoke near 2:30 AM, pondering today's latest questions . . . wa-laa an adventure of discovery through exploration :-)
So, looking closer at what was pointed out we get these search results:
Faith - 160,000 at 0.24 sec
Reaper - 17,100 at 0.29 sec
Faith Reaper - 15,900 at 0.23
BTW, if you use the 'Sort By' feature at the upper right and use 'Date' instead of 'Relevance' you will get a different result.
Okay, what does that mean. Let's look. When typing in 'Faith Reaper' the first article is 'Avatars: What Should a "Faith Reaper" Avatar Look Like?' Next, I copy/pasted to a Word document (Oopps!). Then, I used the find/replace feature (Including comments) for Word to count the the keywords first and then the keyword phrase:
Faith - 254
Reaper - 185
Faith Reaper - 179
I substituted 'Faith Reaper' with a 'blank'. What remains for the keywords are:
Faith - 95
Reaper - 6
So, how specifically HP does the final summary for 'Faith Reaper' with that count number asked can strongly be suggested it is the phrase as the key search. That seems so since the pattern for all contrast an article is the same. Or, 'Faith Reaper' as a phrase is distinguished with a lesser count in both cases of keywords.
Still, drinking coffee more playtime is offered. What about Google remembering it is close to everything?
Faith - About 535,000,000 results (0.40 seconds)
Reaper - About 41,300,000 results (0.27 seconds)
Faith Reaper - About 941,000 results (0.36 seconds)
Aha . . . the same pattern. Let's look even closer yet.
Faith Reaper distinguished as specific search phrase when set in quotation marks.
"Faith Reaper" - About 13,300 results (0.26 seconds)
hmmmmm . . . Google is less than HP? Google = 13,300 < HP = 15,900. Seems perhaps what is unfeatured may have an impact as those are not made available to Google for search results. Possibly a question closed may be in that group too?
A conclusion is 'Faith Reaper' is unique. :-)