Praise be to Allah, the Lord of the Worlds; and may His blessings and peace be upon our Prophet Muhammad and upon all his Family and Companions.
Linguistically, Hajj means repairing to a place for the sake of visit of something glorified, and in the terminology of Shari'ah, it implies the repairing to the House of Allah to observe the necessary devotions as Ihram, Wuquf at Arafah and al-sa'e in a specified time (Shawwal, Zul-Qa'da and Zul-Hijjah). Umrah means literally a visit, and in Shari'ah it means a visit to the House of Allah at anytime of the year without standing at Arafa, i.e. it consists of Tawaf around the Ka'ba, Sa'e between Safa and Marwa in the state of Ihram. Other actions as Rami, staying at Mina are only related to Hajj. Allah knows best.