With regards to the description of ‘Eesaa ‘alaihissalaam being described as “His Word which He conveyed to Maryam” the Shaykh Muhammad ibn Saalih al ‘Uthaymeen rahimahullaah states:
Allaah applied the (term) “Word” to him because he ‘alaihissalaam was created by means of a word. So the hadeeth is not taken upon its apparent (literal) meaning, since ‘Eesaa ‘alaihissalaam was not a word because he used to eat and drink and pass urine and open his bowels. And all the (usual) human situations would occur to him.
Allaah, the Most High, states:
Indeed the example of ‘Eesaa with Allaah is just as the example of Aadam. He (Allaah) created him from dust then He said to him, “Be!” and he was.
Soorah aale ‘Imraan (3) aayah 59
And ‘Eesaa ‘alaihissalaam was not the Word of Allaah because the Speech of Allaah is an Attribute existing with Him and not separate and distinct from Him.
As for ‘Eesaa, then he was a being separate and distinct from Allaah subhaanahu ; he would come and go and eat food and drink.
(Al qawl ul mufeed (1/73) of Shaykh Muhammad ibn Saalih al ‘Uthaymeen rahimahullaah, translated by Nasser ibn Najam)
 Hadeeth reported by Al Bukhaaree (4453) and Muslim (28)