In French, when you want to say superior/inferior to, you use the irregular comparatives supérieur / inférieur à.
Irregular comparatives in French
Look at these comparisons:
Note that the following adjectives are naturally comparative:
supérieur/e à (superior to)
inférieur/e à (inferior to)
Therefore, they have no comparative or superlative form; you never say plus inférieur que or moins supérieur que.
They agree in gender and number with the noun they refer to.
Note also that they are followed by the preposition à rather than que.
Note that the preposition à will become au or aux when followed by articles le or les.
See Definite articles contract with à and de in French (French Contracted Articles)
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