No 40: alternate
√AmE We decided to make alternate arrangements in case the hotel was fully booked
√BrE We decided to make alternative arrangements in case the hotel was fully booked
remember that AmE refers to American English and BrE refers to British English
In British English alternate and alternative have different meanings
Alternate = (1) happening in turn, first one then the other : alternate periods of sun and rain
(2) every second (day, week, etc): Our local football team plays at home on alternate Saturdays
Alternative = (of two or more things) that maybe used, had, done, etc., instead of another; other
Note that in American English alternate can also be used with the same meaning as alternative