yardstick - gauge, a measure⏎
voluntary - uncharged (fee), offered, done willingly⏎
vanilla - ordinary, not special⏎
specialist - expert, highly skilled person⏎
transfer - move over, carry, duplicate, displace⏎
vacation - holiday⏎
satisfactory - acceptable, sufficient, good enough⏎
wake-up call - sudden warning⏎
split - divide, apportion, share (something)⏎
seller - vendor, trader⏎