Step 1: What counts as a “font”.
Treat a font as a distinct typeface + style/weight. Words set in the same face and weight belong to one group; any change in face (serif vs. sans, letter-shape construction) or weight (regular vs. bold) is a new group.
Step 2: Cluster by diagnostic glyphs.
Scan for distinctive shapes: single- vs. double-storey a, looped vs. open g, the tail of y, serif presence, the crossbar of t, and the aperture of e.
Step 3: Count distinct groups.
Grouping the words by these diagnostics yields nine visually distinct font groups. Hence the total number of fonts used is \(\boxed{9}\).