Spelfabet

Meaning ‘shape’

conform

conformist

conformity

deform

deformity

disinform

freeform

formal

formality

formant

format

formation

formless

formula

formulate

inform

informal

informant

information

informative

informer

malformed

malformation

misinform

misinformation

nonconformist

nonconformity

platform

preformat

reform

reformer

reformation

transform

transformation

unformatted

uniform

uniformity

uninformative

waveform

Note that ‘former’ and ‘perform’ are not from the same root.