What is similitude?
When a sound changes some of its phonetic features under the influence of a neighbouring sound but still remains the same phoneme, it shows similitude with the neighbouring sound.
Place of articulation
T - postalveolar position in TRY
U: - forward position in HUMAN
N - dental position in TENTH
Manner of articulation
P - non aspirated in SPY
R - fricative in DRIVE
Voice
L - devoiced in PLAY
R - devoiced in CRY
J - devoiced in HUGE
W - devoiced in QUITE
Lip position
P is pronounced with spread lips in PEOPLE, but with rounded lips in POOL.