Final answer:
The book 'Because of Mr. Terupt' features a word game called 'Dollar Words' but does not explicitly state the first word Luke comes up with.
Step-by-step explanation:
In the book Because of Mr. Terupt, the first "Dollar word" that Luke comes up with is not explicitly mentioned. The "Dollar Word" game is an educational activity within the story where students try to find words where the value of the letters adds up to exactly one dollar, with each letter's value corresponding to its position in the alphabet (A=1 cent, B=2 cents, C=3 cents, and so on). The book incorporates this game as part of the learning experiences provided by Mr. Terupt, their teacher.