You might not need to decrease your font size.
Your paragraph spacing is set with multiple line spacing. Select both words adn open the paragraph formatting dialogue box. Set 0 in both Above and Below fields, and Single in Line Spacing. If that does not get you close enough, you can set a specific (Exactly) line spacing in points in the same field. Start with 48 and play with the number from there, checking to make sure that you're not cutting off letters. If you don't want to increase the height of the box, but the words still won't fit, select both words and press Ctrl+< (Ctrl+Shift+,) to reduce the point size by one point at a time.

Best,
Ulodesk