a grown son, mature son

Jesus was always referred to as Hweeos.  

uihos/a "on"/hwee-os'  
Apparently a primary word; a "son" (sometimes of animals), used very widely of immediate, remote or figurative kinship: - child, foal, son.

This indicates a different level of maturity when compared to Teknon. Uihos/Hweeos indicates maturity. Teknon indicates immaturity.

Strongs:  

5207 υιος huios hwee-os'  
apparently a primary word; TDNT-8:334,1206; n m  
AV-son( s) 85, Son of Man + 444 87 (TDNT-8:400, 1210), Son of God + 2316 49, child( ren) 49, Son 42, his Son + 848 21, Son of David + 1138 15 (TDNT-8:478, 1210), my beloved Son + 27 + 3350 7, thy Son + 4575 5, only begotten Son + 3339 3, his (David's) son + 846 3, firstborn son + 4316 2, misc 14; 382  
1) a son  
1a) rarely used for the young of animals  
1b) generally used of the offspring of men  
1c) in a restricted sense, the male offspring (one born by a father and of a mother)  
1d) in a wider sense, a descendant, one of the posterity of any one,  
1d1) the children of Israel  
1d2) sons of Abraham 1e)) used to describe one who depends on another or is his follower  
1e1) a pupil  
2) son of man  
2a) term describing man, carrying the connotation of weakness and mortality  
2b) son of man, symbolically denotes the fifth kingdom in #Da 7:13 and by this term its humanity is indicated in contrast with the barbarity and ferocity of the four preceding kingdoms (the Babylonian, the Median and the Persian, the Macedonian, and the Roman) typified by the four beasts. In the book of Enoch (2nd Century) it is used of Christ.  
2c) used by Christ himself, doubtless in order that he might intimate his Messiahship and also that he might designate himself as the head of the human family, the man, the one who both furnished the pattern of the perfect man and acted on behalf of all mankind. Christ seems to have preferred this to the other Messianic titles, because by its lowliness it was least suited to foster the expectation of an earthly Messiah in royal splendour.  
3) son of God  
3a) used to describe Adam (#Lu 3:38)  
3b) used to describe those who are born again (#Lu 20:36) and of angels and of Jesus Christ  
3c) of those whom God esteems as sons, whom he loves, protects and benefits above others  
3c1) in the OT used of the Jews  
3c2) in the NT of Christians  
3c3) those whose character God, as a loving father, shapes by chastisements (#Heb 12:5-8)  
3d) those who revere God as their father, the pious worshippers of God, those who in character and life resemble God, those who are governed by the Spirit of God, repose the same calm and joyful trust in God which children do in their parents (#Ro 8:14, Ga 3:26), and hereafter in the blessedness and of the life eternal will openly wear this dignity of the sons glory of God. Term used preeminently of Jesus Christ, as enjoying the supreme love of God, united to him in affectionate intimacy, privy to his saving councils, obedient to the Father's will in all his acts  
 
For Synonyms see entry 5868 & 5943  

teknon/a child/τέκνον/tek'-non  
From the base of G5098; (as produced): - child, daughter, son.  
 
paidion/a childling/Παιδίον/pahee-dee'-on  
Neuter diminutive of G3816; a childling (of either sex), that is, (properly) an infant, or (by extension) a half grown boy or girl; figuratively an immature Christian: - (little, young) child, damsel.