screw log vs patent log

screw log and patent log both are nouns.

Word	Noun	Adjective	Verb	Adverb
screw log	Yes	No	No	No
patent log	Yes	No	No	No

As nouns, screw log and patent log are synonyms defined as:

screw log and patent log: a cigar-shaped log with rotary fins that measure the ship's speed

Other synonyms of screw log include taffrail log.

screw log (noun)	patent log (noun)
a cigar-shaped log with rotary fins that measure the ship's speed	a cigar-shaped log with rotary fins that measure the ship's speed