Istiqbāl: facing the Stone.
Istilām: touching the Stone.
Taqbīl: kissing the Stone.
These are not synonyms. Crowding may prevent physical contact, but a circuit of tawaf does not become invalid just because the pilgrim could not kiss the Stone.
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Facing, touching and kissing are distinct
Book of Hajj: Entering Mecca and Tawaf al-Qudum
Istiqbāl: facing the Stone.
Istilām: touching the Stone.
Taqbīl: kissing the Stone.
These are not synonyms. Crowding may prevent physical contact, but a circuit of tawaf does not become invalid just because the pilgrim could not kiss the Stone.