orange
Referring to the color that lies between red and yellow, like that of a ripe orange. The adjective 'orange' is not declined in German.
Sie hat sich ein leuchtend orange T-Shirt gekauft.
She bought herself a bright orange T-shirt.

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Referring to the color that lies between red and yellow, like that of a ripe orange. The adjective 'orange' is not declined in German.
Sie hat sich ein leuchtend orange T-Shirt gekauft.
She bought herself a bright orange T-shirt.

A special feature of 'orange' is that, as an adjective before a noun, it is usually not declined. It keeps its base form, no matter what gender or case the noun has.
Er trägt einen orange Pullover.
He is wearing an orange sweater.
As in many other languages, the color 'orange' is named after the fruit of the same name, 'die Orange' (the orange). The noun for the fruit is feminine: 'die Orange'.
Die Wände sind in einem warmen Orange gestrichen.
The walls are painted in a warm orange.
The color itself can be used as a noun. In this case, it is neuter and capitalized: 'das Orange' (the orange). It then describes the shade of color itself.
Das kräftige Orange des Sonnenuntergangs war beeindruckend.
The strong orange of the sunset was impressive.
yellow
'gelb' and 'orange' are both color words and are close to each other in the color spectrum. 'gelb' fits things like lemons, sunflowers, or ripe bananas. 'orange' lies between yellow and red and fits things such as oranges or pumpkins. They can be confused when a color is not completely clear, for example with clothing, light, or autumn leaves. Also important: as an adjective in German, 'orange' is normally not changed, so you say 'eine orange Tasche' (an orange bag), not 'eine orangee Tasche'.

Für den Ausflug zieht Tom eine orange Jacke an.
Tom puts on an orange jacket for the trip.
Die Blätter am kleinen Baum vor dem Haus werden langsam gelb.
The leaves on the small tree in front of the house are slowly turning yellow.