Two words = 1 word
prefix with 'in'
prefix with 'im'
single words
prefix with 're'
100

pathway

path way

100

inlaid

in - laid

100

implant

im - plant

100

camp

camp

100

repay

re - pay

200

madman

mad man

200

insist

in - sis - t

200

imprint

im - print

200

cash

cash

200

restrict

re - stric - t

300
flashback

flash back

300

incomplete

in - com - plete

300

impair

im - pair

300

canvas

canvas

300

restrain

re - strain

400

pigtail

pig tail

400

inventors

in - ven - tor - s

400

importance

im - por - tan - ce

400

dim

dim
400

reconstruct

re - con - struct

500

maintain

main tain 

500

intolerant

in - tol - er - ant

500

immediate

im - med - i - ate

500

fault

fault

500

restart

re - start