Puzzle fans have been left surprised by a set of insulting words including "spinster" and "Toxoplasmosis" hidden in a puzzle book's word search.

After a man bought his girlfriend a copy of Crazy Cat Lady Coloring Book as a joke, he posted one of the puzzles to Imgur, highlighting a number of offensive words hidden among the "kitty-related" words to find.

Known on Imgur as RhodesRuggar, he added the caption: "Word search got dark. Got my girlfriend a crazy cat lady coloring book as a joke. The word search has a bunch of other words in it... (Prozac, Insanity, Depression, Spinster, Lonesome, Reclusive, Lonely)."

Along with "kitty" and "whiskers" a number of offensive words are hidden in this word search. Photo / Imgur

The post has been viewed over 560,000 times and received more than 100 comments from users identifying more offensive terms hidden in the puzzle.

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One beady-eyed person spotted the word "Toxoplasmosis", a parasitic disease that can be contracted from cats.

According to Amazon's description of the book, it's a title "intended for adults" and "celebrates the cultural icon that is the Crazy Cat Lady".

The book where the offensive word search was discovered. Photo / Amazon
The book where the offensive word search was discovered. Photo / Amazon

The description adds that the book is: "A twenty-four page, 8" x 10-1/4" (20.3 cm x 26 cm) celebration of the happiness that comes from living with kitties. Features the story of our Crazy Cat Lady, cat-related activity pages and cats to color. Meow."

As well as finding other offensive words, Imgur users have debated whether or not the insults were deliberate.

RhodesRuggar pointed out: "The other pages are so light-hearted though! It's like they contracted someone to make it who hates cats. Maybe they're dating a cat lady."